Year	Percent
1990	22.764
1991	22.782
1992	23.4
1993	18.023
1994	21.715
1995	17.097
1996	22.314
1997	20.357
1998	18.531
1999	16.834
2000	15.263
2001	15.521
2002	15.782
2003	16.047
2004	16.316
2005	16.589
2006	16.864
2007	17.144
2008	17.427
2009	17.714
2010	19.3
2011	21.2
2012	20.1
2013	21.8
2014	23.1
2015	22
2016	20.7
2017	20.977
2018	21.254
2019	21.531
2020	21.808
2021	22.085
2022	22.362
2023	22.639
2024	22.915
2025	23.192
2026	23.469
2027	23.746
2028	24.023
2029	24.3
2030	24.577