Year	Percent
1990	85.46
1991	82.88
1992	84.227
1993	85.038
1994	85.668
1995	86.369
1996	84.338
1997	85.405
1998	85.198
1999	84.957
2000	84.71
2001	84.567
2002	84.436
2003	84.299
2004	85.138
2005	84.773
2006	84.355
2007	83.883
2008	83.375
2009	82.855
2010	82.265
2011	82.207
2012	81.729
2013	81.413
2014	79.011
2015	80.235
2016	80.712
2017	80.481
2018	80.237
2019	79.999
2020	79.776
2021	79.581
2022	79.407
2023	79.247
2024	79.09
2025	78.934
2026	78.795
2027	78.668
2028	78.545
2029	78.417
2030	78.277