Year	Number
1996	30.319149017334
1998	45.7446823120117
2000	41.2698402404785
2002	39.1534385681152
2003	33.668342590332
2004	31.0679607391357
2005	27.1844654083252
2006	26.0869560241699
2007	29.9516906738281
2008	28.365385055542
2009	33.1753540039063
2010	28.4360198974609
2011	34.1232223510742
2012	36.4928894042969
2013	31.7535552978516
2014	28.0952377319336
2015	29.0476188659668
2016	30.4761905670166
2017	27.1428565979004
2018	28.301887512207
2019	24.5283012390137
2020	29.7169818878174
2021	24.056604385376
2022	25