Year	%
1990	39.8921832884097
1991	35.9223300970874
1992	32.5274725274725
1993	29.8597194388778
1994	28.5163776493256
1995	27.5925925925926
1996	26.7857142857143
1997	26.3793103448276
1998	26.0434056761269
1999	25.9319286871961
2000	25.8461538461539
2001	25.8620689655172
2002	25.9060402684564
2003	26.1034047919294
2004	26.1282660332542
2005	26.2626262626263
2006	26.3549415515409
2007	26.4321608040201
2008	26.5654648956357
2009	26.5178571428571
2010	24.2245199409158
2011	22.3806571605704
2012	20.9413008989952
2013	20.625
2014	21.1397058823529
2015	21.317157712305
2016	21.4108910891089
2017	22.0868859114901
2018	23.0675839740996
2019	24.394250513347
2020	26.2350936967632
2021	26.744671959883
2022	26.5893642542983