Year	Percent
1950	16.1721
1955	18.15042
1960	18.21265
1965	18.14435
1970	15.9484
1975	15.07248
1980	14.56065
1985	14.52334
1990	13.66963
1995	12.78002
2000	11.68502
2005	9.87754
2010	8.62161
2015	8.36116
2020	8.1967
2025	7.88339
2030	7.27171
2035	6.57517
2040	6.05131
2045	5.7953
2050	5.73157
2055	5.67698
2060	5.5219
2065	5.2922
2070	5.08195
2075	4.96791
2080	4.95941
2085	4.98995
2090	4.98014
2095	4.90997
2100	4.82171