Year	Percent
1950	19.13358
1955	18.25175
1960	15.27442
1965	13.30467
1970	13.65294
1975	14.20148
1980	15.03664
1985	13.17468
1990	11.44075
1995	11.28688
2000	11.74767
2005	14.33846
2010	16.13021
2015	16.75331
2020	16.93644
2025	17.7856
2030	19.70203
2035	21.12744
2040	21.939
2045	21.5345
2050	21.23381
2055	22.04179
2060	23.12705
2065	24.29917
2070	24.53045
2075	24.17503
2080	24.11449
2085	24.49183
2090	24.99049
2095	25.18028
2100	24.9456