Year	Percent
1950	3.01768
1955	3.31406
1960	3.57191
1965	3.79843
1970	3.96934
1975	4.09304
1980	4.16629
1985	4.23136
1990	4.48391
1995	4.45688
2000	4.31776
2005	4.19563
2010	4.15357
2015	4.35663
2020	4.75283
2025	5.2275
2030	5.76888
2035	6.38335
2040	7.03332
2045	7.69082
2050	8.34123
2055	8.95634
2060	9.55028
2065	10.16394
2070	10.86279
2075	11.67375
2080	12.4642
2085	13.21202
2090	13.92159
2095	14.61446
2100	15.31634