Year	Percent
1950	7.69586
1955	10.08472
1960	11.15539
1965	10.77601
1970	8.15248
1975	7.10021
1980	7.53974
1985	8.29992
1990	8.44721
1995	7.24359
2000	6.27772
2005	5.02376
2010	4.40968
2015	4.92793
2020	4.70937
2025	4.31036
2030	3.95008
2035	3.73244
2040	3.63805
2045	3.74101
2050	3.88525
2055	3.9054
2060	3.81775
2065	3.75288
2070	3.77422
2075	3.9022
2080	4.07635
2085	4.19974
2090	4.23292
2095	4.20507
2100	4.19351