Year	Percent
1950	16.63982
1955	16.03924
1960	15.51683
1965	14.41436
1970	12.13732
1975	11.57533
1980	11.12092
1985	10.03804
1990	9.00329
1995	9.04324
2000	7.98576
2005	7.39749
2010	6.78605
2015	5.93175
2020	5.60124
2025	5.34193
2030	5.14463
2035	4.90281
2040	4.64356
2045	4.42564
2050	4.28054
2055	4.2174
2060	4.18731
2065	4.15201
2070	4.1043
2075	4.0653
2080	4.05343
2085	4.09077
2090	4.15124
2095	4.20364
2100	4.23064