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 {"year":"1979","crude_birth_rate":11.4,"total_fertility_rate":null}, 
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 {"year":"1981","crude_birth_rate":12.1,"total_fertility_rate":1.55}, 
 {"year":"1982","crude_birth_rate":11.8,"total_fertility_rate":1.49}, 
 {"year":"1983","crude_birth_rate":11.5,"total_fertility_rate":1.44}, 
 {"year":"1984","crude_birth_rate":11.5,"total_fertility_rate":1.42}, 
 {"year":"1985","crude_birth_rate":11.2,"total_fertility_rate":1.38}, 
 {"year":"1986","crude_birth_rate":11.7,"total_fertility_rate":1.44}, 
 {"year":"1987","crude_birth_rate":11.4,"total_fertility_rate":1.39}, 
 {"year":"1988","crude_birth_rate":12.4,"total_fertility_rate":1.51}, 
 {"year":"1989","crude_birth_rate":12.4,"total_fertility_rate":1.52}, 
 {"year":"1990","crude_birth_rate":12.9,"total_fertility_rate":1.62}, 
 {"year":"1991","crude_birth_rate":12.9,"total_fertility_rate":1.6}, 
 {"year":"1992","crude_birth_rate":13.1,"total_fertility_rate":1.67}, 
 {"year":"1993","crude_birth_rate":13.4,"total_fertility_rate":1.69}, 
 {"year":"1994","crude_birth_rate":13.5,"total_fertility_rate":1.72}, 
 {"year":"1995","crude_birth_rate":13.2,"total_fertility_rate":1.67}, 
 {"year":"1996","crude_birth_rate":13.7,"total_fertility_rate":1.76}, 
 {"year":"1997","crude_birth_rate":13.1,"total_fertility_rate":1.71}, 
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 {"year":"1999","crude_birth_rate":12.9,"total_fertility_rate":1.71}, 
 {"year":"2000","crude_birth_rate":13.1,"total_fertility_rate":1.78}, 
 {"year":"2001","crude_birth_rate":12.4,"total_fertility_rate":1.66}, 
 {"year":"2002","crude_birth_rate":12,"total_fertility_rate":1.63}, 
 {"year":"2003","crude_birth_rate":11.7,"total_fertility_rate":1.62}, 
 {"year":"2004","crude_birth_rate":11.9,"total_fertility_rate":1.66}, 
 {"year":"2005","crude_birth_rate":11.5,"total_fertility_rate":1.62}, 
 {"year":"2006","crude_birth_rate":11.7,"total_fertility_rate":1.64}, 
 {"year":"2007","crude_birth_rate":11.4,"total_fertility_rate":1.61}, 
 {"year":"2008","crude_birth_rate":11.4,"total_fertility_rate":1.6}, 
 {"year":"2009","crude_birth_rate":11.3,"total_fertility_rate":1.59}, 
 {"year":"2010","crude_birth_rate":11.6,"total_fertility_rate":1.63}, 
 {"year":"2011","crude_birth_rate":10.9,"total_fertility_rate":1.51}, 
 {"year":"2012","crude_birth_rate":11.3,"total_fertility_rate":1.57}, 
 {"year":"2013","crude_birth_rate":11.3,"total_fertility_rate":1.55}, 
 {"year":"2014","crude_birth_rate":10.9,"total_fertility_rate":1.4955688}, 
 {"year":"2015","crude_birth_rate":10.7,"total_fertility_rate":1.47}, 
 {"year":"2016","crude_birth_rate":10.4,"total_fertility_rate":1.4}, 
 {"year":"2017","crude_birth_rate":10.4,"total_fertility_rate":1.39}, 
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 {"year":"2019","crude_birth_rate":10.1,"total_fertility_rate":1.34}, 
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 {"year":"2021","crude_birth_rate":10.5,"total_fertility_rate":1.38}, 
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