请教下大家。如下面的数据所示，第一列是国家，第二列是年份，第三列是死亡率。我想画一张散点图（以及加上fitted line)，y轴是死亡率，x轴是年份，每条fitted line是一个国家，也就是这张图对比各国每年的死亡率。
twoway (scatter infant_mortality cohort, by(country))做出来的的是多图（每个国家一张），我想做一张图，不同颜色标记不同的国家。

input str241 country float(cohort infant_mortality)
"Albania" 1963 .12964821
"Albania" 1961 .11756945
"Albania" 1959 .17251062
"Albania" 1962.1804266
"Albania" 1960 .16824675
"Armenia" 1963 .12446976
"Armenia" 1954 .16591215
"Armenia" 1957 .14935613
"Armenia" 1959 .21624994
"Armenia" 1960.1514981
"Armenia" 1956 .244179
"Armenia" 1958 .14389873
"Armenia" 1951 .20835567
"Armenia" 1965 .13090563
"Armenia" 1962 .16911244
"Armenia" 1953.3071585
"Armenia" 1961 .12235165
"Armenia" 1964 .12826705
"Armenia" 1952.2609403
"Armenia" 1955 .27262306
"Azerbaijan" 1958.4147317
"Azerbaijan" 1957 .29798102
"Azerbaijan" 1959.3439572
"Azerbaijan" 1961 .177675
"Azerbaijan" 1956 .51560235
"Azerbaijan" 1960 .20896506
"Bangladesh" 1961.7728097
"Bangladesh" 1968.5373411
"Bangladesh" 1966.5955024
"Bangladesh" 1948 1.4682517
"Bangladesh" 1929 2.1323013
"Bangladesh" 1969 .53458095
"Bangladesh" 1930 2.3631
"Bangladesh" 1928 2.0900908
"Bangladesh" 1955 1.3169818
"Bangladesh" 19461.680828
"Bangladesh" 1926 1.8872
"Bangladesh" 1950 1.2614527
"Bangladesh" 1954 1.2759485
"Bangladesh" 1965.6672041
"Bangladesh" 1967.6280594
"Bangladesh" 1960.7658887
"Bangladesh" 1958.9772873
"Bangladesh" 1952 1.2099605
"Bangladesh" 1964.6918044
"Bangladesh" 1944 2.0431647
"Bangladesh" 1956 1.1372423
"Bangladesh" 1945 1.8511453
"Bangladesh" 1963.8101509
"Bangladesh" 1959 1.0311894
"Bangladesh" 1962.8908584
"Bangladesh" 1949 1.3301382
"Bangladesh" 1947 1.4293647
"Bangladesh" 19271.824046
"Bangladesh" 19531.252165
"Bangladesh" 1951 1.3276463
"Bangladesh" 1957 1.0679879
"Benin" 19472.259152
"Benin" 1960 1.3150716
"Benin" 1961 1.3716106
"Benin" 1966.6087108
"Benin" 1933 2.375
"Benin" 1957 1.5701957
"Benin" 1963.6132221
"Benin" 1953 1.5204005
"Benin" 1949 2.0563455
"Benin" 1951 1.7583046
"Benin" 1946 2.4002166
"Benin" 1955 1.37862
"Benin" 1967.9986115
"Benin" 1950 1.7812805
"Benin" 1964.4052391
"Benin" 19361.631579
"Benin" 19521.405878
"Benin" 1965.4805155
"Benin" 1954 2.1485138
"Benin" 1956 1.7820315
"Benin" 1958 1.4078722
"Benin" 1935 2.15
"Benin" 1959 1.3197508
"Benin" 1934 2.0784316
"Benin" 1962.6280737
"Benin" 1948 2.2505536
"Bolivia" 1947 1.0142474
"Bolivia" 19541.065258
"Bolivia" 1949.9119773
"Bolivia" 1960 .818656
"Bolivia" 1958.8224878
"Bolivia" 1963.9411321