Year	Number
1996	52
1998	47.7611923217773
2000	45.7711448669434
2002	41.7910461425781
2003	38.3084564208984
2004	33.6538467407227
2005	30.2884616851807
2006	28.8461532592773
2007	29.8076915740967
2008	28.8461532592773
2009	27.962085723877
2010	29.8578205108643
2011	28.6384983062744
2012	28.1690139770508
2013	28.1690139770508
2014	28.5714282989502
2015	27.5862064361572
2016	25.6157627105713
2017	23.645320892334
2018	26.6990299224854
2019	23.6714973449707
2020	26.0869560241699
2021	29.9516906738281
2022	29.468599319458