Year	Percent
1950	5.88328
1955	6.12517
1960	7.52985
1965	7.9154
1970	6.7189
1975	6.33081
1980	6.62236
1985	6.7461
1990	6.36408
1995	5.55894
2000	5.4898
2005	6.2664
2010	6.65482
2015	4.99292
2020	5.23561
2025	5.64766
2030	5.60886
2035	5.76915
2040	5.76185
2045	5.52628
2050	5.31506
2055	5.3215
2060	5.42893
2065	5.50065
2070	5.4887
2075	5.39652
2080	5.28394
2085	5.22678
2090	5.23103
2095	5.24245
2100	5.21724