Year	Percent
1950	15.51463
1955	16.66163
1960	17.40808
1965	17.84413
1970	17.10092
1975	15.77813
1980	12.89573
1985	12.39899
1990	12.30173
1995	13.06755
2000	12.80955
2005	12.73835
2010	12.61839
2015	12.71001
2020	13.37536
2025	14.63103
2030	16.0242
2035	17.16533
2040	17.97733
2045	18.50773
2050	19.24618
2055	20.20652
2060	21.22613
2065	22.09266
2070	22.6215
2075	22.95384
2080	23.32156
2085	23.75892
2090	24.22189
2095	24.59115
2100	24.82996