Year	Percent
1950	16.26144
1955	15.77013
1960	16.05169
1965	16.42606
1970	16.27369
1975	15.15894
1980	12.62969
1985	16.40929
1990	16.50985
1995	17.88378
2000	20.80155
2005	17.21645
2010	16.73438
2015	16.39254
2020	15.51186
2025	15.03134
2030	14.44442
2035	13.6586
2040	12.7898
2045	11.96116
2050	11.19895
2055	10.54217
2060	9.91606
2065	9.31695
2070	8.7081
2075	8.13109
2080	7.63615
2085	7.19523
2090	6.83177
2095	6.50262
2100	6.20138