Year	Percent
1990	66.914
1991	66.765
1992	66.835
1993	66.769
1994	66.665
1995	66.578
1996	66.659
1997	66.702
1998	66.657
1999	66.646
2000	66.758
2001	66.8
2002	67.037
2003	67.171
2004	67.417
2005	69.865
2006	72.208
2007	74.449
2008	76.58
2009	78.598
2010	80.501
2011	81.217
2012	81.792
2013	82.237
2014	82.565
2015	82.466
2016	82.295
2017	82.54
2018	82.776
2019	83.008
2020	83.241
2021	83.481
2022	83.722
2023	83.97
2024	84.231
2025	84.507
2026	84.801
2027	85.108
2028	85.423
2029	85.741
2030	86.06