Year	Percent
1950	13.85869
1955	13.67705
1960	14.71766
1965	14.96096
1970	15.12001
1975	14.76984
1980	14.6283
1985	14.44678
1990	13.3118
1995	12.57042
2000	12.66906
2005	12.11141
2010	10.27845
2015	9.34978
2020	8.77159
2025	8.49246
2030	7.97687
2035	7.35545
2040	6.7456
2045	6.24189
2050	5.88976
2055	5.6425
2060	5.41041
2065	5.1662
2070	4.92548
2075	4.74002
2080	4.61873
2085	4.55542
2090	4.51467
2095	4.47693
2100	4.42722