Year	Percent
1990	89.062
1991	89.097
1992	89.056
1993	88.998
1994	88.962
1995	88.937
1996	88.999
1997	89.054
1998	89.107
1999	89.144
2000	89.159
2001	89.205
2002	89.323
2003	89.272
2004	89.22
2005	89.149
2006	89.594
2007	90.01
2008	90.392
2009	90.734
2010	91.025
2011	90.644
2012	90.179
2013	90.051
2014	89.865
2015	89.62
2016	89.332
2017	89.412
2018	89.499
2019	89.59
2020	89.683
2021	89.768
2022	89.855
2023	89.942
2024	90.027
2025	90.109
2026	90.183
2027	90.254
2028	90.322
2029	90.381
2030	90.432