Year	Percent
1990	17.681
1991	17.7
1992	18.099
1993	18.506
1994	18.919
1995	19.339
1996	19.767
1997	20.201
1998	20.643
1999	21.091
2000	21.547
2001	22.01
2002	22.48
2003	22.957
2004	23.441
2005	23.932
2006	24.43
2007	24.935
2008	25.447
2009	25.966
2010	25.01
2011	25.88
2012	24.46
2013	24.28
2014	24.34
2015	24.58
2016	22.75
2017	23.015
2018	23.28
2019	23.545
2020	23.81
2021	24.075
2022	24.339
2023	24.604
2024	24.869
2025	25.134
2026	25.399
2027	25.664
2028	25.929
2029	26.194
2030	26.459