Year	Percent
1990	66.428
1991	66.399
1992	66.342
1993	66.299
1994	66.269
1995	66.25
1996	66.2
1997	66.118
1998	65.741
1999	65.637
2000	65.578
2001	65.562
2002	65.527
2003	65.507
2004	65.504
2005	65.516
2006	65.552
2007	65.609
2008	65.682
2009	65.774
2010	65.889
2011	66.052
2012	66.147
2013	66.269
2014	66.407
2015	66.558
2016	66.704
2017	66.869
2018	67.026
2019	67.168
2020	67.291
2021	67.397
2022	67.486
2023	67.563
2024	67.634
2025	67.705
2026	67.774
2027	67.843
2028	67.917
2029	67.999
2030	68.095