13.107


                                     3.290



                                     1968


                                    20.799


                                    20.458


                                    12.808


                                     3.343



                                     1969


                                    16.324


                                    17.114


                                    10.229


                                     2.576



                                     1970


                                    17.949


                                    16.431


                                    11.598


                                     2.330



                                     1971


                                    27.176


                                    27.992


                                    16.529


                                     4.106



                                     1972


                                    23.666


                                    23.463


                                    12.018


                                     3.367



                                     1973


                                    16.508


                                    16.025


                                     8.744