Year	Number
1996	19.8924732208252
1998	20.3208560943604
2000	26.5957450866699
2002	31.7460308074951
2003	30.1587295532227
2004	33.9901466369629
2005	40
2006	39.5121955871582
2007	37.8640785217285
2008	41.262134552002
2009	36.3636360168457
2010	34.2857131958008
2011	36.4928894042969
2012	34.1232223510742
2013	37.9146919250488
2014	41.8269233703613
2015	43.8095245361328
2016	42.3809509277344
2017	43.8095245361328
2018	39.523811340332
2019	37.1428565979004
2020	43.8095245361328
2021	45.7142868041992
2022	48.113208770752