Year	Percent
1950	3.6233
1955	3.88582
1960	4.18006
1965	4.40462
1970	4.54282
1975	4.7486
1980	4.94116
1985	5.06578
1990	5.68822
1995	5.7595
2000	6.13277
2005	6.69128
2010	7.53484
2015	8.65822
2020	9.70938
2025	10.6639
2030	11.51696
2035	12.24108
2040	13.47957
2045	15.33866
2050	17.46545
2055	19.58792
2060	21.63431
2065	23.08038
2070	24.37066
2075	25.50143
2080	26.70713
2085	27.91632
2090	29.05915
2095	30.10003
2100	31.07885