Year	Percent
1950	8.02802
1955	8.55475
1960	9.04251
1965	10.04979
1970	11.31213
1975	12.12246
1980	12.5464
1985	13.5636
1990	16.78427
1995	18.12504
2000	19.27479
2005	19.91332
2010	22.24374
2015	24.55458
2020	26.7679
2025	29.27239
2030	31.63143
2035	34.47137
2040	36.74501
2045	37.90963
2050	38.17606
2055	38.29458
2060	38.70395
2065	39.3028
2070	39.76387
2075	39.99202
2080	39.88016
2085	39.66962
2090	39.6017
2095	39.64287
2100	39.74053