Table:
text: Destroyer escort
Comparison with contemporary frigates
Comparison with contemporary frigates
Name_ Date_ Nation Displacement Speed Number_ Notes_
Commandant Rivière-class frigate 1962 France 1,750 tons 25 knots 13 dual purpose
Mackenzie-class 1962 Canada 2,366 tons 28 knots 4 anti-submarine
Hvidbjørnen-class frigate 1962 Denmark 1,345 tons 18 knots 4 fishery protection
Type 12I frigate 1963 UK 2,450 tons 30 knots 26 general purpose
Bronstein-class 1963 US 2,360 tons 26 knots 2 
Garcia-class 1964 US 2,620 tons 27 knots 10 
Oslo-class frigate 1966 Norway 1,450 tons 25 knots 5 
Brooke-class 1966 US 2,640 tons 27 knots 6 guided missile
Peder Skram-class frigate 1966 Denmark 2,030 tons 28 knots 2 fast
Van Speijk-class frigate 1967 Netherlands 2,200 tons 28 knots 6 
Alpino-class frigate 1968 Italy 2,000 tons 28 knots 2

Question: Under destroyer escort, Italy used the Alpino-class frigate in 1968. what was its top speed?