Year	Percent
1950	4.42188
1955	4.16281
1960	4.24048
1965	4.65693
1970	5.16708
1975	5.57623
1980	5.86635
1985	5.91219
1990	6.2196
1995	5.83773
2000	5.35122
2005	5.01831
2010	4.63721
2015	4.47695
2020	4.31406
2025	4.25347
2030	4.39374
2035	4.72683
2040	5.14242
2045	5.56598
2050	5.96822
2055	6.47882
2060	7.16028
2065	8.14046
2070	9.41281
2075	10.75442
2080	12.11898
2085	13.57012
2090	15.11694
2095	16.72383
2100	18.33639