Year	Percent
1950	12.23454
1955	12.27861
1960	14.24131
1965	15.17742
1970	16.58025
1975	15.72853
1980	13.78596
1985	12.04639
1990	12.1126
1995	11.38884
2000	11.14289
2005	10.76626
2010	9.07067
2015	7.96272
2020	7.21318
2025	7.89348
2030	7.30067
2035	6.63504
2040	6.02864
2045	5.57264
2050	5.34383
2055	5.23579
2060	5.10955
2065	4.8789
2070	4.56803
2075	4.33706
2080	4.22577
2085	4.21401
2090	4.2094
2095	4.13917
2100	4.00625