Year	Percent
1950	4.11832
1955	3.97367
1960	3.89169
1965	3.89541
1970	3.99857
1975	4.2191
1980	4.5467
1985	4.98222
1990	6.07285
1995	6.8205
2000	7.51305
2005	7.9944
2010	8.67519
2015	9.71467
2020	11.10269
2025	12.67037
2030	14.26425
2035	15.87001
2040	17.4987
2045	19.32203
2050	21.20556
2055	23.15465
2060	24.92495
2065	26.82213
2070	28.73021
2075	30.57443
2080	32.23562
2085	33.69683
2090	34.96449
2095	36.04346
2100	36.9355