Year	Percent
1950	5.28578
1955	6.01518
1960	6.07172
1965	6.16563
1970	6.05881
1975	5.97579
1980	6.47864
1985	7.24153
1990	9.12219
1995	10.82288
2000	12.69835
2005	14.44442
2010	15.60562
2015	15.39922
2020	17.7884
2025	19.39729
2030	22.88978
2035	26.0363
2040	26.84823
2045	28.15589
2050	29.30698
2055	30.61409
2060	31.63571
2065	32.54162
2070	33.07434
2075	33.6186
2080	34.28962
2085	34.99453
2090	35.61941
2095	36.06939
2100	36.3721