group(country)
(mean) tradetogdp_a
year==  1871.0000
year==  1872.0000
year==  1873.0000
year==  1874.0000
year==  1875.0000
year==  1876.0000
year==  1877.0000
year==  1878.0000
year==  1879.0000
year==  1880.0000
year==  1881.0000
year==  1882.0000
year==  1883.0000
year==  1884.0000
year==  1885.0000
year==  1886.0000
year==  1887.0000
year==  1888.0000
year==  1889.0000
year==  1890.0000
year==  1891.0000
year==  1892.0000
year==  1893.0000
year==  1894.0000
year==  1895.0000
year==  1896.0000
year==  1897.0000
year==  1898.0000
year==  1899.0000
year==  1900.0000
year==  1901.0000
year==  1902.0000
year==  1903.0000
year==  1904.0000
year==  1905.0000
year==  1906.0000
year==  1907.0000
year==  1908.0000
year==  1909.0000
year==  1910.0000
year==  1911.0000
year==  1912.0000
year==  1913.0000
year==  1914.0000
year==  1915.0000
year==  1916.0000
year==  1917.0000
year==  1918.0000
year==  1919.0000
year==  1920.0000
year==  1921.0000
year==  1922.0000
year==  1923.0000
year==  1924.0000
year==  1925.0000
year==  1926.0000
year==  1927.0000
year==  1928.0000
year==  1929.0000
year==  1930.0000
year==  1931.0000
year==  1932.0000
year==  1933.0000
year==  1934.0000
year==  1935.0000
year==  1936.0000
year==  1937.0000
year==  1938.0000
year==  1939.0000
year==  1940.0000
year==  1941.0000
year==  1942.0000
year==  1943.0000
year==  1944.0000
year==  1945.0000
year==  1946.0000
year==  1947.0000
year==  1948.0000
year==  1949.0000
year==  1950.0000
year==  1951.0000
year==  1952.0000
year==  1953.0000
year==  1954.0000
year==  1955.0000
year==  1956.0000
year==  1957.0000
year==  1958.0000
year==  1959.0000
year==  1960.0000
year==  1961.0000
year==  1962.0000
year==  1963.0000
year==  1964.0000
year==  1965.0000
year==  1966.0000
year==  1967.0000
year==  1968.0000
year==  1969.0000
year==  1970.0000
year==  1971.0000
year==  1972.0000
year==  1973.0000
year==  1974.0000
year==  1975.0000
year==  1976.0000
year==  1977.0000
year==  1978.0000
year==  1979.0000
year==  1980.0000
year==  1981.0000
year==  1982.0000
year==  1983.0000
year==  1984.0000
year==  1985.0000
year==  1986.0000
year==  1987.0000
year==  1988.0000
year==  1989.0000
year==  1990.0000
year==  1991.0000
year==  1992.0000
year==  1993.0000
year==  1994.0000
year==  1995.0000
year==  1996.0000
year==  1997.0000
year==  1998.0000
year==  1999.0000
year==  2000.0000
year==  2001.0000
year==  2002.0000