The Creativity Production Index-the average number of spots produced by a sample of agency offices-got a slight bump in April, marking the second month in a row that the index has posted gains. Not only that, but the CPI has now posted year-to-year gains in 11 of the last 12 months. Los Angeles' production totals are also upbeat, according to numbers released by the Entertainment Industry Development Corporation (EIDC). The EIDC recorded 537 shooting days for commercials in April, up 13 percent from a year before. In May, the total slipped to 448, but that was still good enough to outpace the previous May by a whopping 60 percent. To date, the EIDC's monthly tally has posted year-to-year gains in seven of the last eight months, and the year-to-date total is running ahead of last year's pace by 19.4 percent.