Year	Percent
1950	4.19274
1955	4.09349
1960	4.03746
1965	4.05237
1970	4.1562
1975	4.38606
1980	4.73193
1985	5.16864
1990	6.19501
1995	6.86918
2000	7.46822
2005	7.85039
2010	8.41452
2015	9.32706
2020	10.57231
2025	11.96674
2030	13.36121
2035	14.75366
2040	16.17411
2045	17.81317
2050	19.56672
2055	21.43639
2060	23.15867
2065	25.04258
2070	26.974
2075	28.86382
2080	30.58111
2085	32.09956
2090	33.4149
2095	34.53506
2100	35.45582