Year	Percent
1990	72.418
1991	72.439
1992	72.459
1993	72.49
1994	72.517
1995	72.55
1996	72.593
1997	72.632
1998	72.67
1999	72.702
2000	72.727
2001	72.779
2002	72.841
2003	72.918
2004	73.011
2005	73.117
2006	73.231
2007	73.361
2008	73.502
2009	73.647
2010	73.794
2011	73.976
2012	74.144
2013	74.303
2014	74.399
2015	74.499
2016	74.597
2017	74.772
2018	74.942
2019	75.098
2020	75.233
2021	75.34
2022	75.435
2023	75.517
2024	75.589
2025	75.652
2026	75.7
2027	75.742
2028	75.785
2029	75.836
2030	75.9