Year	Percent
1950	9.82758
1955	10.18379
1960	10.69834
1965	9.34839
1970	10.77507
1975	11.5013
1980	10.82146
1985	10.29492
1990	9.70641
1995	9.56477
2000	8.69442
2005	8.51748
2010	8.35949
2015	8.08239
2020	7.44407
2025	6.81706
2030	5.94809
2035	5.65471
2040	5.4572
2045	5.33988
2050	5.17151
2055	4.969
2060	4.79469
2065	4.69118
2070	4.67652
2075	4.69901
2080	4.71177
2085	4.70099
2090	4.68486
2095	4.68135
2100	4.71406