Year	Percent
1990	90.987
1991	90.912
1992	90.679
1993	90.652
1994	90.488
1995	90.338
1996	90.372
1997	90.491
1998	90.515
1999	90.604
2000	91.055
2001	91.303
2002	91.425
2003	91.372
2004	91.345
2005	91.304
2006	91.225
2007	91.139
2008	91.053
2009	91.249
2010	91.17
2011	90.929
2012	90.875
2013	90.859
2014	90.876
2015	90.822
2016	90.776
2017	90.73
2018	90.68
2019	90.627
2020	90.572
2021	90.517
2022	90.461
2023	90.407
2024	90.359
2025	90.319
2026	90.287
2027	90.262
2028	90.243
2029	90.226
2030	90.211