Tokyo Astronomical Observatory, University of Tokyo (-1987) National Astronomical Observatory of Japan (1988-) Steinheil 10.5 cm Refractor, photographic (1988 Jun-) Zeiss 20 cm Refractor, drawing by projection 10 cm New Sunspot Telescope with a 2k x 2k CCD Year Obs.Days R North South Total 1929 233 77.65 1930 244 42.95 1931 229 23.83 1932 237 10.66 1933 246 5.04 1934 209 8.44 1935 210 56.10 1936 207 74.65 1937 222 106.09 1938 237 125.31 1939 259 46.27 56.57 99.92 1940 301 31.91 41.84 73.75 1941 239 31.23 19.28 50.51 1942 265 17.76 14.09 31.85 1943 232 13.13 3.76 16.89 1944 269 0.87 2.25 8.21 1945 246 10.09 18.25 28.34 1946 259 47.47 42.69 90.16 1947 282 70.97 92.92 163.89 1948 268 69.93 81.85 151.77 1949 273 82.68 67.80 150.47 1950 287 54.51 32.67 87.18 1951 295 36.92 25.17 62.10 1952 297 14.48 14.53 29.02 1953 287 8.26 4.24 12.50 1954 286 2.29 2.34 4.63 1955 292 24.05 13.19 37.24 1956 273 66.48 58.06 124.54 1957 255 80.15 82.10 162.25 1958 253 90.44 81.44 171.88 1959 245 108.11 38.78 146.89 1960 270 67.66 42.56 110.22 1961 277 33.12 17.58 50.70 1962 274 23.12 8.74 31.86 1963 288 17.36 5.35 22.71 1964 267 7.16 2.13 9.29 1965 287 12.26 2.09 14.35 1966 288 37.40 6.07 43.48 1967 270 60.58 34.81 95.39 1968 267 53.71 46.12 99.83 1969 262 59.44 41.58 101.02 1970 239 64.53 55.73 120.26 1971 264 40.52 43.06 83.57 1972 269 30.72 51.73 82.45 1973 286 20.84 24.29 45.13 1974 285 13.65 23.26 36.92 1975 281 12.07 6.05 18.12 1976 275 6.44 7.23 13.67 1977 277 18.94 12.06 31.00 1978 284 60.46 48.01 108.47 1979 275 93.65 78.32 171.97 1980 249 78.67 82.24 160.91 1981 275 86.91 81.40 168.31 1982 275 66.23 73.79 140.02 1983 277 21.81 60.61 82.42 1984 271 19.84 38.56 58.40 1985 258 9.21 10.08 19.29 1986 273 5.87 4.85 10.73 1987 293 8.86 16.87 25.72 1988 269 52.79 39.25 92.04 1989 268 81.61 73.88 155.49 1990 265 75.70 84.53 160.23 1991 249 65.75 106.59 172.34 1992 264 36.51 63.19 99.69 1993 244 27.86 26.98 54.83 1994 280 15.01 14.95 29.96 1995 272 6.40 9.91 16.31 1996 276 4.09 3.62 7.71 1997 276 10.82 6.45 17.27 1998 205 25.90 33.05 58.95 1999 217 51.15 38.36 89.51 2000 150 54.44 56.73 111.17 2001 203 55.84 46.61 102.45 2002 236 47.75 60.52 108.27 2003 187 27.27 38.99 66.26 2004 234 16.30 29.10 45.40 2005 225 11.37 20.58 31.95 2006 159 3.68 13.77 17.45 2007 233 1.57 8.32 9.89 2008 240 1.17 2.60 3.78 2009 216 2.65 1.29 3.94 2010 245 13.43 7.58 21.01 2011 243 41.73 21.60 63.33 2012 257 34.88 32.31 67.19 2013 267 32.83 45.07 77.91 2014 261 32.47 60.29 92.76 2015 241 29.29 28.73 58.02 2016 232 23.47 9.10 32.57 2017 266 12.23 5.10 17.33 2018 247 2.29 2.21 4.50 2019 239 3.71 0.09 3.80 2020 240 1.55 5.91 7.45 2021 248 11.69 15.52 27.22 2022 246 35.79 32.15 67.94 2023 269 58.38 48.29 106.67 2024 65 45.72 52.91 98.63