Year	%
1990	37.9310344827586
1991	38.6363636363636
1992	38.7755102040816
1993	37.2549019607843
1994	37.037037037037
1995	35
1996	34.3283582089552
1997	33.3333333333333
1998	33.3333333333333
1999	31.9148936170213
2000	31.4285714285714
2001	31.0344827586207
2002	31.0077519379845
2003	29.8611111111111
2004	29.559748427673
2005	29.2134831460674
2006	29.1457286432161
2007	29.1479820627803
2008	29.0836653386454
2009	28.8256227758007
2010	28.1645569620253
2011	27.10027100271
2012	25.9953161592506
2013	25.2049180327869
2014	23.6328125
2015	20.5685618729097
2016	20.5592105263158
2017	19.5814648729447
2018	18.7414500683994
2019	18.6351706036745
2020	18.8602442333786
2021	18.7088274044796
2022	18.3879093198992