Year	Percent
1950	3.98111
1955	3.80724
1960	3.71229
1965	3.68819
1970	3.70172
1975	3.7753
1980	3.92126
1985	4.17678
1990	4.76373
1995	5.30797
2000	5.74289
2005	5.88771
2010	6.42975
2015	7.04755
2020	8.33741
2025	9.66736
2030	11.85872
2035	14.04466
2040	17.2868
2045	21.54614
2050	25.2084
2055	28.07096
2060	30.11178
2065	31.52571
2070	32.75591
2075	33.65079
2080	34.53713
2085	35.26657
2090	35.79696
2095	36.14306
2100	36.39332