Year	Percent
1990	92.932
1991	91.759
1992	91.039
1993	90.487
1994	90.183
1995	88.241
1996	87.475
1997	89.347
1998	89.332
1999	90.391
2000	91.081
2001	91.007
2002	90.909
2003	90.626
2004	89.924
2005	90.265
2006	90.276
2007	90.435
2008	91.253
2009	90.644
2010	90.519
2011	90.906
2012	90.375
2013	90.076
2014	89.542
2015	89.56
2016	89.711
2017	89.708
2018	89.704
2019	89.701
2020	89.705
2021	89.716
2022	89.734
2023	89.756
2024	89.777
2025	89.796
2026	89.813
2027	89.829
2028	89.842
2029	89.851
2030	89.855