| December 1998
|
3,522,700 |
| November 1998 |
3,562,800 |
| October 1998 |
3,573,000 |
| September 1998 |
3,586,900 |
| August 1998 |
3,606,000 |
| July 1998 |
3,617,000 |
| June 1998 |
3,605,400 |
| May 1998 |
3,579,400 |
| April 1998 |
3,548,600 |
| March 1998 |
3,486,600 |
| February 1998 |
3,445,300 |
| January 1998
|
3,442,100 |
|
