Year	Number
1996	14.8936166763306
1998	10.638298034668
2000	8.99470901489258
2002	5.29100513458252
2003	14.070351600647
2004	16.990291595459
2005	16.990291595459
2006	13.5265703201294
2007	13.043478012085
2008	13.4615383148193
2009	11.8483409881592
2010	12.3222751617432
2011	15.6398105621338
2012	11.8483409881592
2013	14.6919431686401
2014	30
2015	35.238094329834
2016	37.6190490722656
2017	31.9047622680664
2018	30.1886787414551
2019	30.1886787414551
2020	33.4905662536621
2021	32.5471687316895
2022	33.4905662536621