Year	Number
1996	35.6783905029297
1998	33.5
2000	26.3681583404541
2002	34.3283576965332
2003	28.8557205200195
2004	31.730770111084
2005	29.6650714874268
2006	26.7942581176758
2007	24.8803825378418
2008	24.0384616851807
2009	33.6492881774902
2010	33.6492881774902
2011	35.2112693786621
2012	31.9248828887939
2013	33.8028182983398
2014	33.1730766296387
2015	31.9047622680664
2016	30.4761905670166
2017	30.4761905670166
2018	29.5238094329834
2019	31.9047622680664
2020	30
2021	27.619047164917
2022	18.3962268829346