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Data source: National Institute of Water and Atmospheric Research.
Year |
Area (km2) |
|---|---|
1990 |
35191.67 |
1991 |
45277.12 |
1992 |
48285.84 |
1993 |
51865.06 |
1994 |
46411.91 |
1995 |
57807.71 |
1996 |
57595.93 |
1997 |
57944.56 |
1998 |
67555.81 |
1999 |
60269.7 |
2000 |
60555.34 |
2001 |
58347.99 |
2002 |
60460.87 |
2003 |
61345.84 |
2004 |
55555.86 |
2005 |
50281.69 |