Year	Percent
1950	3.63758
1955	3.52993
1960	3.58524
1965	3.7228
1970	4.02273
1975	4.46104
1980	4.88475
1985	5.23537
1990	6.0977
1995	6.48506
2000	7.12006
2005	7.95641
2010	8.95385
2015	10.17847
2020	11.82962
2025	13.99174
2030	15.99335
2035	17.65438
2040	19.48402
2045	21.4307
2050	23.56786
2055	25.47395
2060	27.16481
2065	28.78792
2070	30.39358
2075	31.92839
2080	33.30382
2085	34.49364
2090	35.52744
2095	36.42316
2100	37.19697