Contribute correction: 1988 belastingprogramma

 _    _      ___      ______   __   __  
| \  / ||   / _ \\   /_   _//  \ \\/ // 
|  \/  ||  | / \ ||  `-| |,-    \ ` //  
| .  . ||  | \_/ ||    | ||      | ||   
|_|\/|_||   \___//     |_||      |_||   
`-`  `-`    `---`      `-`'      `-`'