Year	Number
1996	27.5
1998	27.8606967926025
2000	24.3781089782715
2002	23.8805961608887
2003	21.3930339813232
2004	18.75
2005	15.865385055542
2006	14.4230766296387
2007	16.3461532592773
2008	17.3076915740967
2009	13.7440757751465
2010	15.6398105621338
2011	14.0845069885254
2012	15.4929580688477
2013	15.962441444397
2014	18.7192115783691
2015	17.7339897155762
2016	14.2857141494751
2017	12.8078813552856
2018	15.5339803695679
2019	14.0096616744995
2020	15.4589376449585
2021	19.8067626953125
2022	18.8405799865723