Year	%
1990	30.5084745762712
1991	29.1139240506329
1992	28.0373831775701
1993	26.6666666666667
1994	25.7009345794392
1995	24.2214532871972
1996	22.7513227513228
1997	20.8677685950413
1998	18.9542483660131
1999	17.3076923076923
2000	15.3617443012884
2001	13.4600760456274
2002	12.2106481481482
2003	11.1842105263158
2004	10.0499168053245
2005	9.03094875697616
2006	8.3220437391136
2007	7.69344141488578
2008	7.00566226268458
2009	6.61022468251384
2010	6.46360474877084
2011	6.37054085155351
2012	6.27634830643989
2013	6.16245686280196
2014	6.10342894515556
2015	6.12864425224812
2016	6.16703101733042
2017	6.20906784276738
2018	6.28947072704798
2019	6.39816564811528
2020	6.46914922533297
2021	6.52914874469427
2022	6.63243762583456