Year	Percent
1950	15.55012
1955	16.58128
1960	17.15967
1965	17.47054
1970	17.75467
1975	18.1745
1980	18.3694
1985	18.39306
1990	17.65665
1995	16.82228
2000	17.16572
2005	17.2645
2010	16.55548
2015	15.65972
2020	14.99935
2025	14.42158
2030	13.84503
2035	13.22093
2040	12.57961
2045	11.93607
2050	11.33382
2055	10.78042
2060	10.25423
2065	9.77296
2070	9.29506
2075	8.83619
2080	8.40683
2085	8.00129
2090	7.63012
2095	7.27549
2100	6.95507