Year	Percent
1950	14.28263
1955	18.4538
1960	16.23398
1965	17.35371
1970	19.24678
1975	18.48491
1980	17.83513
1985	17.34039
1990	17.16557
1995	16.58549
2000	16.29836
2005	15.70206
2010	15.77731
2015	15.51373
2020	14.75076
2025	14.01312
2030	13.41229
2035	12.90131
2040	12.42207
2045	11.93702
2050	11.43206
2055	10.93974
2060	10.46113
2065	10.04903
2070	9.63115
2075	9.22992
2080	8.82509
2085	8.43705
2090	8.06172
2095	7.70143
2100	7.37197