Year	Percent
1950	6.87667
1955	8.94143
1960	10.93614
1965	11.12254
1970	12.00567
1975	11.25632
1980	10.4693
1985	9.6138
1990	8.73301
1995	8.71662
2000	9.24618
2005	9.53965
2010	9.28226
2015	8.72699
2020	7.87722
2025	7.4411
2030	7.21953
2035	7.07123
2040	6.82717
2045	6.49496
2050	6.15011
2055	5.86272
2060	5.67062
2065	5.54623
2070	5.42
2075	5.25792
2080	5.0836
2085	4.93524
2090	4.84382
2095	4.79423
2100	4.75581