Year	Percent
1990	67.731
1991	67.75
1992	67.863
1993	67.999
1994	68.11
1995	68.199
1996	68.252
1997	68.214
1998	68.197
1999	67.958
2000	67.892
2001	67.786
2002	67.706
2003	67.658
2004	67.679
2005	67.721
2006	67.91
2007	68.094
2008	68.271
2009	68.439
2010	68.598
2011	68.761
2012	69.143
2013	69.286
2014	69.375
2015	69.495
2016	69.576
2017	69.641
2018	69.693
2019	69.738
2020	69.784
2021	69.832
2022	69.886
2023	69.943
2024	70.001
2025	70.056
2026	70.109
2027	70.159
2028	70.207
2029	70.255
2030	70.305