Year	Percent
1950	15.12766
1955	14.63924
1960	13.93582
1965	13.42851
1970	13.15372
1975	13.29987
1980	13.4839
1985	13.71881
1990	14.11517
1995	14.7359
2000	15.76965
2005	17.23789
2010	18.78431
2015	20.18533
2020	21.79239
2025	22.9625
2030	24.20461
2035	25.18985
2040	25.48738
2045	25.63869
2050	25.52253
2055	25.57724
2060	25.74103
2065	25.77799
2070	25.60129
2075	25.13684
2080	24.69886
2085	24.35916
2090	24.0934
2095	23.83744
2100	23.55618