Year	Percent
1950	4.16282
1955	4.22774
1960	4.41492
1965	4.49598
1970	4.53319
1975	4.55434
1980	4.69797
1985	5.11104
1990	6.70305
1995	7.85098
2000	9.12276
2005	10.30835
2010	11.93297
2015	14.33336
2020	17.57129
2025	21.09754
2030	24.62819
2035	27.6175
2040	29.85782
2045	31.14264
2050	31.88064
2055	33.1418
2060	34.59385
2065	35.61431
2070	36.46161
2075	37.09162
2080	37.19656
2085	37.06812
2090	36.98251
2095	36.95743
2100	36.95327