Year	Percent
1950	12.23483
1955	12.55702
1960	12.88522
1965	11.99045
1970	10.25547
1975	9.66773
1980	9.02353
1985	8.6761
1990	8.26305
1995	8.28936
2000	7.42256
2005	6.94227
2010	7.193
2015	6.75653
2020	6.32316
2025	6.03696
2030	5.72063
2035	5.46767
2040	5.32916
2045	5.24753
2050	5.15115
2055	5.02794
2060	4.9137
2065	4.81479
2070	4.74633
2075	4.70606
2080	4.67019
2085	4.62697
2090	4.5768
2095	4.53284
2100	4.49653