Year	Percent
1990	65.599
1991	66.055
1992	66.38
1993	66.57
1994	66.614
1995	66.516
1996	66.608
1997	66.612
1998	66.569
1999	66.51
2000	66.784
2001	67.056
2002	67.327
2003	67.597
2004	67.866
2005	68.134
2006	68.401
2007	68.666
2008	68.93
2009	69.281
2010	69.59
2011	69.452
2012	69.239
2013	69.045
2014	68.993
2015	69.165
2016	69.48
2017	69.627
2018	69.773
2019	69.92
2020	70.066
2021	70.213
2022	70.36
2023	70.506
2024	70.653
2025	70.8
2026	70.946
2027	71.093
2028	71.239
2029	71.386
2030	71.533