Year	Percent
1950	3.99631
1955	4.00583
1960	4.12973
1965	4.32969
1970	4.42309
1975	4.49181
1980	4.81327
1985	4.81077
1990	4.9747
1995	4.88311
2000	4.91162
2005	4.95102
2010	5.01656
2015	5.52163
2020	6.10953
2025	6.91749
2030	7.86514
2035	9.01775
2040	10.41216
2045	12.27743
2050	14.622
2055	17.21318
2060	19.41143
2065	21.24279
2070	23.18267
2075	25.02106
2080	26.75062
2085	28.29201
2090	29.65977
2095	30.86762
2100	31.92176