(b) Except as provided in subsection (c) of this section, refueling equipment or machinery used only to dispense clean-burning fuels into motor vehicles is not subject to property tax.

(c) The property tax for refueling equipment or machinery used only to dispense clean-burning fuels into motor vehicles is the applicable tax rate applied to:

(1) 20% of the assessed value in taxable year 1998;

(2) 40% of the assessed value in taxable year 1999;

(3) 60% of the assessed value in taxable year 2000;

(4) 80% of the assessed value in taxable year 2001; and

(5) 100% of the assessed value in taxable year 2002 and each taxable year thereafter.