Year	Percent
1950	7.91762
1955	7.96306
1960	8.2588
1965	7.95578
1970	8.6187
1975	8.71165
1980	8.30982
1985	8.20779
1990	7.78566
1995	6.17181
2000	5.06223
2005	4.6013
2010	4.26915
2015	4.70417
2020	5.04829
2025	4.48968
2030	4.13237
2035	3.83479
2040	3.72867
2045	3.81797
2050	4.00472
2055	4.14483
2060	4.14156
2065	4.0723
2070	4.04895
2075	4.10348
2080	4.20757
2085	4.30023
2090	4.32678
2095	4.28779
2100	4.22301