Year	Percent
1990	20.645
1991	20.847
1992	21.035
1993	21.209
1994	21.393
1995	21.601
1996	21.75
1997	21.901
1998	22.117
1999	22.323
2000	22.516
2001	22.289
2002	22.143
2003	22.083
2004	22.132
2005	22.572
2006	23.111
2007	23.691
2008	24.149
2009	24.61
2010	24.97
2011	25.147
2012	25.242
2013	25.273
2014	25.319
2015	25.433
2016	25.686
2017	25.901
2018	26.103
2019	26.294
2020	26.473
2021	26.652
2022	26.821
2023	26.971
2024	27.086
2025	27.153
2026	27.169
2027	27.134
2028	27.061
2029	26.968
2030	26.87