Year	Percent
1950	3.03139
1955	3.28395
1960	3.46619
1965	3.49705
1970	3.51742
1975	3.5328
1980	3.32766
1985	3.52259
1990	3.82645
1995	4.13187
2000	4.43426
2005	4.8602
2010	5.4018
2015	5.73394
2020	6.52561
2025	7.67431
2030	8.7324
2035	9.80597
2040	11.29404
2045	12.69546
2050	14.84128
2055	16.66242
2060	18.26603
2065	19.58811
2070	20.47535
2075	21.29784
2080	22.08103
2085	22.85318
2090	23.60181
2095	24.24008
2100	24.73264