Year	Percent
1950	11.21174
1955	10.17629
1960	9.43694
1965	9.65921
1970	9.51798
1975	9.24256
1980	8.55903
1985	8.43248
1990	10.27254
1995	9.59856
2000	9.70944
2005	8.17459
2010	7.54343
2015	8.29765
2020	9.75223
2025	11.87653
2030	13.49291
2035	14.71714
2040	15.6234
2045	16.84633
2050	19.35796
2055	21.01758
2060	21.71142
2065	21.76911
2070	22.84547
2075	25.13592
2080	26.88551
2085	28.11781
2090	29.07703
2095	30.10938
2100	31.27258