Year	Percent
1950	3.6007
1955	3.89375
1960	4.47513
1965	4.30018
1970	4.36581
1975	4.6938
1980	4.63588
1985	4.65115
1990	5.28091
1995	5.88347
2000	6.77912
2005	7.98239
2010	9.33724
2015	11.1412
2020	13.31618
2025	16.09379
2030	19.07028
2035	21.39495
2040	23.43451
2045	25.19281
2050	26.9894
2055	28.76279
2060	30.44125
2065	31.86761
2070	32.97417
2075	34.30673
2080	35.42826
2085	36.28607
2090	37.02433
2095	37.66535
2100	38.23368