year,n_days,mean_yield,mean_change_bp
2010,250,2.47968,-0.136546
2011,249,2.056265,-0.457831
2012,250,1.38004,0.044
2013,250,1.62196,0.228
2014,250,1.57964,-0.244
2015,250,0.8532,-0.244
2016,250,0.72628,0.152
2017,249,1.363293,0.301205
2018,250,2.15132,0.008
2019,250,1.53436,-0.08