Year	Number
1996	21.5
1998	25.3731346130371
2000	9.45273590087891
2002	27.3631839752197
2003	22.3880596160889
2004	22.5961532592773
2005	19.7115383148193
2006	31.730770111084
2007	29.3269233703613
2008	29.8076915740967
2009	29.8578205108643
2010	28.9099521636963
2011	28.6384983062744
2012	26.7605628967285
2013	27.6995296478271
2014	30.5418720245361
2015	29.0640392303467
2016	31.5270938873291
2017	31.5270938873291
2018	27.1844654083252
2019	22.2222213745117
2020	21.2560386657715
2021	20.2898559570313
2022	16.9082126617432