Year	Percent
1990	71.272
1991	71.861
1992	71.65
1993	71.24
1994	72.076
1995	72.391
1996	72.331
1997	72.288
1998	72.529
1999	73.104
2000	73.81
2001	72.62
2002	72.52
2003	72.383
2004	72.57
2005	73.921
2006	73.528
2007	73.881
2008	73.542
2009	72.959
2010	73.525
2011	72.272
2012	72.399
2013	72.696
2014	72.487
2015	72.293
2016	72.466
2017	72.405
2018	72.33
2019	72.244
2020	72.149
2021	72.017
2022	71.862
2023	71.698
2024	71.552
2025	71.438
2026	71.344
2027	71.284
2028	71.252
2029	71.238
2030	71.234