Year	Number
1996	24.5
1998	28.8557205200195
2000	25.8706474304199
2002	24.3781089782715
2003	24.3781089782715
2004	26.9230766296387
2005	26.9230766296387
2006	33.1730766296387
2007	28.365385055542
2008	24.0384616851807
2009	21.3270149230957
2010	26.0663509368896
2011	19.7183094024658
2012	20.6572761535645
2013	22.5352115631104
2014	22.660099029541
2015	21.674877166748
2016	18.7192115783691
2017	21.674877166748
2018	22.3300971984863
2019	20.7729473114014
2020	17.3913040161133
2021	19.3236713409424
2022	21.2560386657715