Year	Percent
1990	69.231
1991	69.483
1992	69.667
1993	69.937
1994	69.61
1995	69.442
1996	69.457
1997	69.394
1998	69.128
1999	69.259
2000	69.075
2001	68.927
2002	67.392
2003	68.042
2004	68.602
2005	68.913
2006	69.187
2007	70.299
2008	71.26
2009	68.648
2010	68.465
2011	70.344
2012	70.841
2013	71.146
2014	72.546
2015	73.912
2016	74.061
2017	74.453
2018	74.833
2019	75.174
2020	75.464
2021	75.71
2022	75.911
2023	76.077
2024	76.226
2025	76.367
2026	76.506
2027	76.637
2028	76.761
2029	76.883
2030	77.007