Year	Percent
1950	6.75673
1955	6.55144
1960	6.36865
1965	6.97236
1970	7.50409
1975	7.58116
1980	7.12123
1985	5.83754
1990	5.51663
1995	5.62687
2000	5.91787
2005	6.27116
2010	6.07062
2015	5.52422
2020	5.29155
2025	5.39721
2030	5.59994
2035	5.55365
2040	5.46973
2045	5.40383
2050	5.33574
2055	5.31202
2060	5.358
2065	5.4092
2070	5.4029
2075	5.3568
2080	5.29269
2085	5.23121
2090	5.1865
2095	5.15976
2100	5.12492