Year	Percent
1990	90.931
1991	91.18
1992	91.336
1993	91.497
1994	91.622
1995	91.723
1996	91.757
1997	91.767
1998	92.776
1999	93.665
2000	94.448
2001	95.136
2002	95.74
2003	96.27
2004	95.822
2005	95.323
2006	94.767
2007	94.147
2008	93.458
2009	92.692
2010	91.844
2011	90.905
2012	89.869
2013	89.917
2014	89.979
2015	90.048
2016	90.102
2017	89.814
2018	89.525
2019	89.234
2020	88.943
2021	88.65
2022	88.357
2023	88.064
2024	87.772
2025	87.481
2026	87.192
2027	86.905
2028	86.619
2029	86.334
2030	86.049