Year	%
1990	30.7543520309478
1991	33.0081300813008
1992	35.1540616246499
1993	36.9135802469136
1994	38.4105960264901
1995	39.6019900497512
1996	40.4951370468612
1997	41.0714285714286
1998	41.5753424657534
1999	41.9296116504854
2000	41.9093851132686
2001	41.7508417508418
2002	41.2808308091735
2003	40.4929577464789
2004	39.469964664311
2005	38.4345047923323
2006	37.4567474048443
2007	36.7008681925809
2008	35.9649122807018
2009	35.2472089314195
2010	34.4930629669157
2011	33.8093322606597
2012	33.0494037478705
2013	32.3792486583184
2014	31.754921928038
2015	31.176565266377
2016	30.6703397612489
2017	30.1928133216477
2018	29.7682211672717
2019	29.4141468682505
2020	29.1405433646813
2021	28.9430275345768
2022	29.1231365183707