Year	Percent
1950	4.05621
1955	3.70988
1960	3.53743
1965	3.45035
1970	3.44533
1975	3.51724
1980	3.61776
1985	3.838
1990	4.38008
1995	4.71263
2000	5.11503
2005	5.61831
2010	5.92617
2015	6.97215
2020	8.34985
2025	9.60123
2030	10.93602
2035	12.71393
2040	15.00684
2045	17.8871
2050	20.98042
2055	23.99458
2060	26.80404
2065	29.27782
2070	31.6153
2075	33.58969
2080	35.18881
2085	36.39867
2090	37.31429
2095	38.00047
2100	38.53093