Year	Percent
1950	16.10759
1955	15.24302
1960	14.32866
1965	13.60692
1970	13.18148
1975	12.93012
1980	13.07506
1985	13.53329
1990	13.93494
1995	15.17493
2000	16.50587
2005	17.86414
2010	19.38482
2015	20.41316
2020	21.30592
2025	22.18067
2030	23.05074
2035	23.76103
2040	24.31703
2045	24.50516
2050	24.55428
2055	24.59258
2060	24.60278
2065	24.66556
2070	24.53153
2075	24.26605
2080	23.95069
2085	23.63762
2090	23.33368
2095	23.02392
2100	22.71075