Year	Percent
1990	9.636
1991	9.845
1992	10.326
1993	10.828
1994	11.352
1995	11.898
1996	12.465
1997	13.432
1998	14.46
1999	15.555
2000	16.723
2001	17.965
2002	19.281
2003	20.675
2004	22.156
2005	23.732
2006	22.894
2007	22.101
2008	19.455
2009	20.404
2010	19.863
2011	19.297
2012	18.735
2013	18.183
2014	17.647
2015	19.296
2016	21.624
2017	21.42
2018	21.21
2019	20.992
2020	20.766
2021	20.534
2022	20.294
2023	20.043
2024	19.773
2025	19.483
2026	19.175
2027	18.849
2028	18.51
2029	18.165
2030	17.823