Year	Percent
1950	12.56341
1955	14.05785
1960	13.49152
1965	14.91475
1970	16.54921
1975	15.51901
1980	14.39923
1985	13.64659
1990	12.19075
1995	11.82033
2000	10.73346
2005	9.34869
2010	7.40699
2015	5.97157
2020	5.68086
2025	5.41589
2030	5.0991
2035	4.78322
2040	4.4476
2045	4.15081
2050	3.98798
2055	3.93852
2060	3.93807
2065	3.92288
2070	3.88606
2075	3.85972
2080	3.87054
2085	3.93375
2090	4.0205
2095	4.0992
2100	4.14315