各位好。我有数据如下：

2008	China	5.368679
2009	China	10.27191
2010	China	11.32058
2011	China	11.88313
2012	China	18.64346
2013	China	21.03853
2014	China	14.79839
2015	China	20.26556
2016	China	24.42027
2017	China	25.32076
2008	Manitoba	40.45824
2009	Manitoba	59.37749
2010	Manitoba	60.37274
2011	Manitoba	63.62734
2012	Manitoba	52.39755
2013	Manitoba	61.7517
2014	Manitoba	70.32643
2015	Manitoba	65.98277
2016	Manitoba	61.32922
2017	Manitoba	48.68953
2008	United States of America	52.33519
2009	United States of America	93.42258
2010	United States of America	51.09012
2011	United States of America	72.44342
2012	United States of America	61.02513
2013	United States of America	80.46352
2014	United States of America	77.81561
2015	United States of America	82.49318
2016	United States of America	73.81653
2017	United States of America	72.35381
2018	United States of America

想利用stata得到excel图中的效果：

使用两种方法，得到的图形均不是想要的效果。第一种方法：graph bar (asis) level , over(region,gap(0)) over(year) 。第二种方法：graph twoway bar level year if item=="Wheat"®ion=="China",color(red) ///
||bar level year if item=="Wheat" & region=="Manitoba", color(green) ///
||bar level year if item=="Wheat" & region=="United States of America", color(orange) ///

请问，问题出在哪里呢？怎么做才能得到想要的结果呢？