PERU CONSUMER PRICES RISE 5.9 PCT IN MAY Peru's consumer price index rose 5.9 pct in May to 15,706.5 (base 1979) compared to 6.6 pct in April and 3.3 pct in May 1986, the National Statistics Institute said. It said accumulated inflation for the first five months of this year was 33.8 pct against 24.1 pct for the same period in 1986. Inflation for the year ending May 1987 was 75.7 pct compared to 76.8 pct for the year ending May 1986.