Year	Percent
1950	3.96722
1955	4.37903
1960	5.20286
1965	4.91738
1970	4.86252
1975	4.92306
1980	4.66785
1985	4.50062
1990	4.99447
1995	5.55998
2000	6.52017
2005	7.75815
2010	9.0428
2015	10.79075
2020	12.93259
2025	15.60628
2030	18.54845
2035	20.65355
2040	22.53861
2045	23.9781
2050	25.69862
2055	27.53405
2060	29.25387
2065	30.67809
2070	31.87125
2075	33.26182
2080	34.41517
2085	35.28697
2090	36.03558
2095	36.68151
2100	37.2622