Click here to report volumes in (Cubic Meters) or view data graphically.
| Year | Amount Excluded | Number of Projects |
| 1977 |
619,800 |
3 |
| 1978 |
8,852,600 |
7 |
| 1979 |
1,764,498 |
6 |
| 1980 |
403,300 |
5 |
| 1981 |
2,146,300 |
5 |
| 1982 |
1,689,600 |
5 |
| 1983 |
1,647,200 |
4 |
| 1984 |
940,730 |
6 |
| 1985 |
1,896,300 |
7 |
| 1986 |
2,129,450 |
7 |
| 1987 |
7,377,400 |
19 |
| 1988 |
12,487,500 |
20 |
| 1989 |
15,123,407 |
33 |
| 1990 |
22,880,100 |
31 |
| 1991 |
9,745,900 |
35 |
| 1992 |
3,009,800 |
15 |
| 1993 |
4,469,700 |
10 |
| 1994 |
1,088,000 |
2 |
| 1995 |
1,457,100 |
2 |
| 1996 |
181,000 |
5 |
| 1997 |
1,231,400 |
2 |
| 1998 |
4,329,700 |
1 |
| 1999 |
6,497,100 |
13 |
| 2000 |
10,761,700 |
12 |
| 2001 |
10,061,100 |
18 |
| 2002 |
5,326,800 |
7 |
| 2003 |
3,065,000 |
12 |
| 2004 |
80,500 |
4 |
| 2005 |
2,883,200 |
5 |
| 2006 |
8,772,700 |
11 |
| 2007 |
1,044,300 |
5 |
| 2008 |
1,613,300 |
3 |
| 2009 |
57,700 |
1 |