Year	Percent
1950	10.34695
1955	11.70779
1960	10.64637
1965	9.26071
1970	8.19727
1975	8.91545
1980	9.34568
1985	8.3944
1990	7.52021
1995	6.45371
2000	5.03551
2005	4.54649
2010	4.90974
2015	4.98549
2020	4.88145
2025	4.66179
2030	4.33885
2035	4.09459
2040	4.10029
2045	4.26706
2050	4.39574
2055	4.41164
2060	4.34519
2065	4.27461
2070	4.28818
2075	4.40412
2080	4.54369
2085	4.62471
2090	4.60617
2095	4.54158
2100	4.48689