Year	Percent
1990	54.852
1991	54.919
1992	54.986
1993	55.043
1994	55.086
1995	55.129
1996	55.168
1997	55.214
1998	55.281
1999	55.331
2000	55.373
2001	55.416
2002	55.455
2003	55.491
2004	55.527
2005	56.497
2006	57.182
2007	57.426
2008	56.963
2009	57.828
2010	58.243
2011	58.966
2012	58.616
2013	58.826
2014	59.773
2015	59.801
2016	59.887
2017	60.088
2018	60.287
2019	60.489
2020	60.694
2021	60.899
2022	61.106
2023	61.319
2024	61.537
2025	61.762
2026	61.99
2027	62.225
2028	62.465
2029	62.707
2030	62.949