Year	Percent
1950	14.15081
1955	13.15553
1960	12.42636
1965	12.08358
1970	12.43073
1975	11.98468
1980	13.42352
1985	14.05047
1990	13.00712
1995	14.20468
2000	15.18219
2005	17.2033
2010	19.27754
2015	20.73217
2020	22.55855
2025	24.47468
2030	26.13091
2035	27.10865
2040	27.19206
2045	26.9145
2050	26.50192
2055	26.62432
2060	26.93525
2065	27.21176
2070	27.32389
2075	26.93714
2080	26.51087
2085	26.10173
2090	25.77242
2095	25.5143
2100	25.25904