Year	Percent
1950	7.62884
1955	6.47639
1960	5.64118
1965	5.20785
1970	4.92526
1975	4.66578
1980	4.52764
1985	4.81587
1990	5.37174
1995	5.86654
2000	6.21199
2005	6.83212
2010	7.1294
2015	8.18108
2020	9.86665
2025	12.0365
2030	14.5498
2035	17.25326
2040	21.19545
2045	26.8705
2050	32.12367
2055	34.90049
2060	35.72198
2065	36.16026
2070	37.31641
2075	38.81073
2080	39.67978
2085	39.73986
2090	39.34108
2095	39.05272
2100	39.16606