Year	Percent
1950	16.04012
1955	17.65062
1960	18.10966
1965	14.96327
1970	11.4024
1975	9.99144
1980	8.19637
1985	8.04631
1990	7.79763
1995	8.81284
2000	6.76131
2005	5.94902
2010	5.31115
2015	4.98476
2020	4.65582
2025	4.38203
2030	4.22092
2035	4.0169
2040	3.81774
2045	3.67523
2050	3.60348
2055	3.57804
2060	3.57342
2065	3.55824
2070	3.52447
2075	3.48309
2080	3.45787
2085	3.44115
2090	3.43543
2095	3.42949
2100	3.41007