Year	Percent
1950	4.6391
1955	4.67446
1960	4.82771
1965	4.89541
1970	4.94284
1975	4.95911
1980	5.06598
1985	5.44164
1990	7.18223
1995	8.46482
2000	9.85014
2005	11.14936
2010	12.94988
2015	15.63175
2020	19.13044
2025	22.94341
2030	26.83993
2035	30.22238
2040	32.78327
2045	34.26169
2050	35.11258
2055	36.3796
2060	37.6911
2065	38.51506
2070	39.1456
2075	39.60274
2080	39.58406
2085	39.37678
2090	39.22675
2095	39.1271
2100	39.04238