Year	Percent
1990	24.097
1991	24.141
1992	24.027
1993	24.026
1994	23.986
1995	23.902
1996	23.918
1997	23.856
1998	23.825
1999	23.775
2000	23.802
2001	23.754
2002	23.867
2003	23.883
2004	24.5
2005	24.998
2006	25.502
2007	26.013
2008	26.53
2009	27.054
2010	27.585
2011	28.122
2012	28.665
2013	29.214
2014	29.77
2015	29.449
2016	29.341
2017	29.609
2018	29.878
2019	30.146
2020	30.414
2021	30.682
2022	30.95
2023	31.218
2024	31.486
2025	31.754
2026	32.022
2027	32.29
2028	32.558
2029	32.827
2030	33.095