The bonds of successful IT company Pontenero with a nominal value of 100 euros are being sold with a weird market tip. If the price of Pontenero's basic share rises on stock exchange on the current day, the bond value will be increased by 1.09 per cent. If the price of Pontenero's basic share falls on stock exchange on the current day, the bond value will be reduced, but only by 1.08 per cent (i.e. 0.01 per cent less in comparison with the increasing rate). If the price of Pontenero's basic share does not change on the current given day, the bond value will remain the same.

Task:

In year 2020 with a 260 total stock market trading days for exactly half of days (130 days) the value of Pontenero basic share price rose, but for another half of days (130 days) it fell. Explain, how did the bond price finally change throughout the whole year?