Name: PSC NAT volume Units: million km3 Date range (mmdd-mmdd): 0712-0815 Source: GMAO MERRA2 Missing: -9999.0 Year Data Minumum Maximum 1979 268.82 238.58 293.03 1980 282.06 264.95 317.37 1981 273.33 241.28 303.57 1982 281.94 244.19 325.13 1983 262.62 240.52 289.20 1984 275.18 260.91 299.41 1985 267.66 252.28 288.54 1986 237.29 177.88 271.82 1987 292.92 265.92 318.29 1988 245.88 211.65 285.24 1989 283.63 260.98 303.05 1990 271.60 229.31 297.49 1991 287.09 252.41 317.70 1992 274.99 231.69 313.66 1993 288.67 259.10 329.64 1994 284.14 263.49 314.30 1995 328.63 283.77 373.96 1996 290.36 219.49 341.51 1997 308.95 258.30 356.02 1998 299.52 270.81 326.07 1999 279.71 248.79 309.72 2000 301.39 269.48 329.63 2001 286.85 244.51 316.00 2002 241.92 214.35 265.19 2003 283.43 264.78 299.64 2004 241.95 218.95 270.27 2005 273.67 247.44 311.80 2006 297.24 270.98 320.02 2007 263.80 232.21 293.59 2008 294.88 250.17 326.79 2009 276.86 263.59 293.25 2010 191.13 154.69 265.84 2011 267.99 257.27 279.69 2012 223.57 205.18 250.62 2013 271.09 237.70 312.83 2014 260.22 232.58 289.01 2015 258.53 229.96 284.93 2016 282.98 257.01 312.70 2017 263.49 227.13 305.19 2018 279.81 257.71 297.20 2019 273.72 239.83 315.29 2020 294.57 267.91 340.00 2021 292.85 246.02 324.05 2022 284.98 263.36 305.55 2023 276.44 225.63 334.43