year,n_days,mean_yield,mean_change_bp
2010,250,2.4797,-0.1365
2011,249,2.0563,-0.4578
2012,250,1.38,0.044
2013,250,1.622,0.228
2014,250,1.5796,-0.244
2015,250,0.8532,-0.244
2016,250,0.7263,0.152
2017,249,1.3633,0.3012
2018,250,2.1513,0.008
2019,250,1.5344,-0.08