| Year | Cultivated area (ha) | Production (tonnes) | Yield per ha (tonnes) |
| 1961 | 82,000 | 94,000 | 1.15 |
| 1962 | 83,000 | 104,000 | 1.25 |
| 1963 | 115,000 | 183,000 | 1.59 |
| 1964 | 110,000 | 147,322 | 1.34 |
| 1965 | 56,000 | 72,954 | 1.30 |
| 1966 | 127,000 | 133,082 | 1.05 |
| 1967 | 110,000 | 109,687 | 1.00 |
| 1968 | 128,000 | 104,000 | 0.81 |
| 1969 | 129,000 | 126,000 | 0.98 |
| 1970 | 151,000 | 132,000 | 0.87 |
| 1971 | 153,000 | 171,000 | 1.12 |
| 1972 | 155,000 | 187,000 | 1.21 |
| 1973 | 130,824 | 301,000 | 2.30 |
| 1974 | 163,000 | 223,000 | 1.37 |
| 1975 | 204,000 | 265,000 | 1.30 |
| 1976 | 267,000 | 346,000 | 1.30 |
| 1977 | 243,000 | 314,000 | 1.29 |
| 1978 | 258,000 | 387,000 | 1.50 |
| 1979 | 260,000 | 262,000 | 1.01 |
| 1980 | 245,000 | 291,000 | 1.19 |
| 1981 | 280,000 | 200,000 | 0.71 |
| 1982 | 300,000 | 320,000 | 1.07 |
| 1983 | 224,110 | 349,231 | 1.56 |
| 1984 | 271,210 | 355,385 | 1.31 |
| 1985 | 236,540 | 427,692 | 1.81 |
| 1986 | 273,760 | 547,692 | 2.00 |
| 1987 | 351,190 | 644,615 | 1.84 |
| 1988 | 345,000 | 615,385 | 1.78 |
| 1989 | 385,310 | 718,461 | 1.86 |
| 1990 | 384,500 | 740,000 | 1.92 |
| 1991 | 368,700 | 624,615 | 1.69 |
| 1992 | 306,570 | 392,220 | 1.28 |
| 1993 | 353,700 | 641,000 | 1.81 |
| 1994 | 352,600 | 614,300 | 1.74 |
| 1995 | 394,000 | 622,600 | 1.58 |
| 1996 | 513,400 | 806,800 | 1.57 |
| 1997 | 439,300 | 549,700 | 1.25 |
| 1998 | 654,500 | 849,100 | 1.30 |
| 1999 | 379,100 | 728,600 | 1.92 |
| 2000 | 415,600 | 781,538 | 1.88 |
| 2001 | 405,860 | 867,692 | 2.14 |
| 2002 | 565,600 | 984,615 | 1.74 |
| 2003 | 620,800 | 1,096,923 | 1.77 |
| 2004 | 613,130 | 1,058,462 | 1.73 |
| 2005 | 701,990 | 1,167,692 | 1.66 |
| 2006 | 633,770 | 1,206,154 | 1.90 |
| 2007 | 557,981 | 1,341,846 | 2.40 |
| 2008 | 887,660 | 1,420,570 | 1.60 |
| 2009 | 805,630 | 1,334,800 | 1.66 |
| 2010 | 1,136,290 | 2,650,120 | 2.33 |
| 2011 | 1,119,324 | 2,248,320 | 2.01 |
| 2012 | 799,361 | 1,800,551 | 2.25 |
| 2013 | 928,273 | 2,194,750 | 2.36 |
| 2014 | 957,218 | 1,681,000 | 1.76 |
| 2015 | 1,154,467 | 1,937,000 | 1.68 |
| 2016 | 1,039,205 | 2,229,000 | 2.14 |
| 2017 | 1,097,283 | 2,451,707 | 2.23 |
| 2018 | 1,032,902 | 3,414,815 | 3.31 |
| 2019 | 1,052,547 | 3,474,766 | 3.30 |
| 2020 | 1,586,952 | 4,528,000 | 2.85 |
| 2021 | 955,729 | 2,688,000 | 2.81 |