Year	%
1990	41.7910447761194
1991	41.3333333333333
1992	39.2857142857143
1993	38.7096774193548
1994	37.2549019607843
1995	36.3636363636364
1996	35.8974358974359
1997	34.9593495934959
1998	34.375
1999	33.5820895522388
2000	33.0985915492958
2001	32.0261437908497
2002	31.0975609756098
2003	30.4597701149425
2004	29.0322580645161
2005	28.7878787878788
2006	27.8260869565217
2007	27.3469387755102
2008	26.5384615384615
2009	25.8181818181818
2010	25
2011	24.5161290322581
2012	23.98753894081
2013	23.3695652173913
2014	22.4343675417661
2015	21.8142548596112
2016	21.1498973305955
2017	20.6627680311891
2018	20.1851851851852
2019	19.6836555360281
2020	19.2629815745394
2021	18.9102564102564
2022	18.6520376175549