Year	Percent
1950	8.26356
1955	7.12918
1960	6.03471
1965	6.27223
1970	6.66883
1975	6.46171
1980	5.84592
1985	6.35847
1990	5.96729
1995	6.66318
2000	7.07787
2005	5.57095
2010	3.7199
2015	4.25007
2020	5.05434
2025	4.91075
2030	4.80046
2035	4.62118
2040	4.31088
2045	4.22069
2050	4.53249
2055	4.9008
2060	5.02187
2065	4.92851
2070	4.77335
2075	4.69681
2080	4.78293
2085	4.9539
2090	5.06127
2095	5.02177
2100	4.89221