GERMAN 2.2 PCT GROWTH AVERAGE SEEN TO 1991 The economy will grow by an average rate of 2.2 pct a year in real terms between now and the end of 1991, Westdeutsche Landesbank Girozentrale (WestLB) said in an annual report. A year ago WestLB had forecast average growth of just under three pct for 1986-1990. The 1987 report said gross national product would only expand a real 1.7 pct this year -- below previous expectations -- because of weaker exports. Growth rates will pick up later, however, producing a 2.2 pct increase on average for the five-year period. MORE