Year	Percent
1950	10.43477
1955	12.68504
1960	12.97049
1965	12.13158
1970	12.14574
1975	10.60367
1980	9.70967
1985	8.60302
1990	8.17527
1995	7.64703
2000	6.82318
2005	6.21381
2010	4.77131
2015	4.88289
2020	4.63303
2025	4.65704
2030	4.76183
2035	4.68004
2040	4.42653
2045	4.23321
2050	4.21059
2055	4.31368
2060	4.44982
2065	4.51285
2070	4.46782
2075	4.39835
2080	4.39675
2085	4.48081
2090	4.59475
2095	4.66126
2100	4.64933