Year	Number
1996	13
1998	20.8955230712891
2000	16.4179096221924
2002	28.3582096099854
2003	33.8308448791504
2004	27.4038467407227
2005	19.230770111084
2006	24.0384616851807
2007	23.5576915740967
2008	23.5576915740967
2009	18.9573459625244
2010	16.1137447357178
2011	13.6150236129761
2012	12.6760559082031
2013	13.6150236129761
2014	13.3004922866821
2015	8.86699485778809
2016	13.3004922866821
2017	29.5566501617432
2018	37.8640785217285
2019	37.1980667114258
2020	38.6473426818848
2021	42.512077331543
2022	45.4106292724609