Year	Percent
1950	5.15184
1955	5.27159
1960	5.25934
1965	5.05228
1970	4.76645
1975	4.39236
1980	3.95325
1985	3.32635
1990	3.84922
1995	3.95657
2000	4.16593
2005	4.12946
2010	4.25149
2015	5.23715
2020	6.62194
2025	9.17272
2030	12.16105
2035	15.63309
2040	18.94044
2045	21.11162
2050	23.15009
2055	25.12346
2060	26.31364
2065	27.33458
2070	28.62246
2075	30.02963
2080	31.60678
2085	32.8131
2090	33.58471
2095	34.04963
2100	34.40496