Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2021.

Table 1.3 Number of participants per state in 2021.

Table 1.4 USA map view of the participating states in 2021.

Table 1.5 Participation at level in states in 2021.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2020.

Table 1.3 Number of participants per state in 2020.

Table 1.4 USA map view of the participating states in 2020.

Table 1.5 Participation at level in states in 2020.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2019.

Table 1.3 Number of participants per state in 2019.

Table 1.4 USA map view of the participating states in 2019.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2018.

Table 1.3 Number of participants per state in 2018.

Table 1.4 USA map view of the participating states in 2018.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2017.

Table 1.3 Number of participants per state in 2017.

Table 1.4 USA map view of the participating states in 2017.

Table 1.5 Participation at level in states in 2017.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2016.

Table 1.3 Number of participants per state in 2016.

Table 1.4 USA map view of the participating states in 2016.

Table 1.5 Participation at level in states in 2016.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2015.

Table 1.3 Number of participants per state in 2015.

Table 1.4 Comparison of participation in 2015 and 2014.

Table 1.5 USA map view of the participating states in 2015.

Table 1.6 Participation at level in states AL – MN in 2015.

Table 1.7 Participation at level in states MO – WI in 2015.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2014.

Table 1.3 Number of participants per state in 2014.

Table 1.4 Comparison of participation in 2014 and 2013.

Table 1.5 USA map view of the participating states in 2014.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2013.

Table 1.3 Number of participants per state in 2013.

Table 1.4 Comparison of participation in 2013 and 2012.

Table 1.5 USA map view of the participating states in 2013.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2012.

Table 1.3 Number of participants per state in 2012.

Table 1.4 Comparison of participation in 2012 and 2011.

Table 1.5 USA map view of the participating states in 2012.

Table 1.6 Score statistics for each level in 2012.

Table 1.1 How the number of the participants has changed since 1998.

Table 1.2 Number of participants at each level in 2011.

Table 1.3 Number of participants per state in 2011.

Table 1.4 Comparison of participation in 2011 and 2010.

Table 1.5 USA map view of the participating states in 2011.

Table 1.6 Score statistics for each level in 2011.

Table 1.1 Number of participants at each level in 2010.

Table 1.2 Score statistics for each level in 2010.

Table 1.3 USA map view of the participating states in 2010.