Year	Percent
1950	6.081
1955	6.57272
1960	7.45914
1965	7.49286
1970	6.75383
1975	5.59132
1980	5.41158
1985	5.45235
1990	5.85034
1995	6.38868
2000	6.20597
2005	5.70688
2010	5.50211
2015	5.40276
2020	5.68282
2025	5.625
2030	5.5136
2035	5.41336
2040	5.31296
2045	5.26785
2050	5.3022
2055	5.34892
2060	5.34344
2065	5.29757
2070	5.23193
2075	5.17071
2080	5.12956
2085	5.10397
2090	5.06658
2095	5.01337
2100	4.93825