Year	Percent
1950	14.04475
1955	14.17144
1960	14.24157
1965	14.2181
1970	14.17783
1975	14.08653
1980	13.98231
1985	13.84883
1990	13.62416
1995	13.17099
2000	12.83399
2005	12.56121
2010	12.36592
2015	12.33297
2020	12.41427
2025	12.62693
2030	12.95491
2035	13.42658
2040	14.04986
2045	14.95177
2050	16.15477
2055	17.53355
2060	18.89115
2065	20.09928
2070	21.147
2075	22.05774
2080	22.88382
2085	23.57349
2090	24.07695
2095	24.40591
2100	24.59392