Year	Percent
1950	11.29076
1955	11.31019
1960	11.10874
1965	10.92959
1970	10.69131
1975	11.37007
1980	11.97279
1985	12.82897
1990	15.36593
1995	15.78751
2000	16.45615
2005	17.44239
2010	18.94291
2015	20.36206
2020	21.8681
2025	23.45423
2030	24.61025
2035	25.76235
2040	26.37009
2045	27.36566
2050	28.31159
2055	29.03376
2060	29.39367
2065	29.72646
2070	30.42115
2075	31.20217
2080	32.07507
2085	32.83384
2090	33.516
2095	34.17159
2100	34.87186