Year	Percent
1950	10.06742
1955	9.20606
1960	9.96343
1965	9.34589
1970	9.89439
1975	9.82658
1980	9.22233
1985	9.01698
1990	8.48823
1995	7.18426
2000	6.01826
2005	5.44134
2010	5.6601
2015	5.50765
2020	5.19228
2025	4.77221
2030	4.25464
2035	4.02099
2040	4.10456
2045	4.24654
2050	4.32764
2055	4.30163
2060	4.20876
2065	4.13847
2070	4.18386
2075	4.30877
2080	4.43373
2085	4.48495
2090	4.46909
2095	4.4299
2100	4.42309