Year	Percent
1950	4.89138
1955	4.5086
1960	4.15543
1965	3.85077
1970	3.65159
1975	3.50948
1980	4.4948
1985	3.8893
1990	3.914
1995	3.64315
2000	3.9918
2005	3.44994
2010	3.69499
2015	4.60701
2020	6.07745
2025	7.5151
2030	9.23053
2035	11.24365
2040	13.41191
2045	15.56246
2050	17.76062
2055	19.76841
2060	21.32142
2065	22.69086
2070	23.93809
2075	25.4371
2080	26.7895
2085	28.03411
2090	29.13357
2095	30.08432
2100	30.91288