Year	Percent
1950	10.13767
1955	10.28084
1960	10.58484
1965	9.6574
1970	10.63763
1975	10.76967
1980	10.28506
1985	9.77675
1990	8.85782
1995	8.67308
2000	7.80516
2005	7.59864
2010	7.57602
2015	6.95456
2020	6.28836
2025	5.81829
2030	5.12219
2035	4.90321
2040	4.76124
2045	4.67687
2050	4.54609
2055	4.38019
2060	4.23891
2065	4.16292
2070	4.16543
2075	4.19883
2080	4.22255
2085	4.2237
2090	4.22153
2095	4.23394
2100	4.28192