Year	Percent
1990	91.056
1991	91.064
1992	91.379
1993	91.985
1994	92.484
1995	92.951
1996	92.142
1997	91.696
1998	91.66
1999	91.944
2000	92.346
2001	91.486
2002	91.283
2003	91.61
2004	92.304
2005	93.158
2006	92.081
2007	91.82
2008	92.064
2009	92.657
2010	93.748
2011	93.605
2012	93.488
2013	93.502
2014	93.7
2015	94.019
2016	93.318
2017	92.769
2018	92.489
2019	92.458
2020	92.588
2021	91.828
2022	91.235
2023	90.881
2024	90.792
2025	90.908
2026	90.31
2027	89.877
2028	89.659
2029	89.671
2030	89.855