Year	Percent
1990	71.463
1991	71.844
1992	72.232
1993	72.637
1994	72.789
1995	72.759
1996	72.946
1997	73.117
1998	73.142
1999	73.178
2000	73.266
2001	73.423
2002	73.475
2003	73.473
2004	73.438
2005	73.397
2006	73.509
2007	73.552
2008	73.561
2009	73.609
2010	73.588
2011	73.68
2012	73.724
2013	73.703
2014	73.618
2015	73.499
2016	73.498
2017	73.498
2018	73.49
2019	73.477
2020	73.459
2021	73.437
2022	73.415
2023	73.397
2024	73.386
2025	73.387
2026	73.398
2027	73.421
2028	73.458
2029	73.515
2030	73.593