Year	Number
1996	40.5
1998	45.2736320495605
2000	45.2736320495605
2002	42.7860679626465
2003	46.2686576843262
2004	47.5961532592773
2005	51.9230766296387
2006	44.711540222168
2007	45.6730766296387
2008	45.1923065185547
2009	44.5497627258301
2010	43.6018943786621
2011	41.3145523071289
2012	42.7230033874512
2013	39.4366188049316
2014	39.4088668823242
2015	37.9310340881348
2016	34.4827575683594
2017	33.9901466369629
2018	32.5242729187012
2019	30.917875289917
2020	31.4009666442871
2021	31.4009666442871
2022	31.8840579986572