Oxygen Use by Year

Successful summits on peaks 7000m and above, broken down by whether the summiter used supplemental oxygen.

0%20%40%60%80%100%19401960198020002020% of summits using O₂
Year Summits With O₂ Without O₂ % With O₂
1930 11 3 8 27.3%
1935 1 0 1 0.0%
1936 2 0 2 0.0%
1939 6 0 6 0.0%
1950 2 0 2 0.0%
1952 2 0 2 0.0%
1953 7 2 5 28.6%
1954 13 0 13 0.0%
1955 21 13 8 61.9%
1956 10 10 0 100.0%
1957 2 0 2 0.0%
1958 2 0 2 0.0%
1960 28 10 18 35.7%
1961 9 0 9 0.0%
1962 22 0 22 0.0%
1963 8 6 2 75.0%
1964 11 5 6 45.5%
1965 28 9 19 32.1%
1969 21 0 21 0.0%
1970 41 12 29 29.3%
1971 12 4 8 33.3%
1972 33 1 32 3.0%
1973 28 15 13 53.6%
1974 34 3 31 8.8%
1975 57 32 25 56.1%
1976 38 10 28 26.3%
1977 27 15 12 55.6%
1978 128 44 84 34.4%
1979 143 52 91 36.4%
1980 110 27 83 24.5%
1981 122 27 95 22.1%
1982 107 27 80 25.2%
1983 120 26 94 21.7%
1984 191 27 164 14.1%
1985 157 38 119 24.2%
1986 137 10 127 7.3%
1987 116 11 105 9.5%
1988 203 52 151 25.6%
1989 222 89 133 40.1%
1990 246 80 166 32.5%
1991 238 52 186 21.8%
1992 224 99 125 44.2%
1993 289 169 120 58.5%
1994 273 68 205 24.9%
1995 358 133 225 37.2%
1996 398 128 270 32.2%
1997 326 136 190 41.7%
1998 371 159 212 42.9%
1999 292 129 163 44.2%
2000 399 190 209 47.6%
2001 423 232 191 54.8%
2002 472 246 226 52.1%
2003 603 387 216 64.2%
2004 716 419 297 58.5%
2005 579 376 203 64.9%
2006 1032 702 330 68.0%
2007 898 681 217 75.8%
2008 887 583 304 65.7%
2009 1024 647 377 63.2%
2010 799 601 198 75.2%
2011 1069 765 304 71.6%
2012 949 706 243 74.4%
2013 1169 909 260 77.8%
2014 599 424 175 70.8%
2015 172 67 105 39.0%
2016 1020 887 133 87.0%
2017 1319 1082 237 82.0%
2018 1487 1353 134 91.0%
2019 1706 1468 238 86.0%
2020 115 89 26 77.4%
2021 725 658 67 90.8%
2022 1364 1185 179 86.9%
2023 1737 1514 223 87.2%
2024 1856 1609 247 86.7%
2025 1238 1186 52 95.8%