2.768



                                     1974


                                    11.854


                                    11.772


                                     6.972


                                     1.834



                                     1975


                                    11.894


                                    11.561


                                     7.043


                                      965



                                     1976


                                    11.578


                                    12.128


                                     6.738


                                     1.805



                                     1977


                                    12.952


                                    13.683


                                     7.534


                                     2.075



                                     1978


                                    14.109


                                    15.404


                                     8.527


                                     2.568



                                     1979


                                    13.547


                                    14.600


                                     7.743


                                     2.395