“…4% Green, 1976a,b;Kirch, 1983;McCoy & Cleghorn, 1988;Yen, 1976 15.8% Clark & Michlovic, 1996;Davidson, 1969;Hunt & Kirch, 1988;Janetski, 1980;Kirch & Hunt, 1993;Kirch et al, 1990;Lohse, 1980;Nagaoka, 1993;Smith, 1976;Steadman, 1993bSteadman, , 2006Steadman & Pergill, 2004 Society 33.3% Davidson, 1967;Green & Green, 1967;Leach et al, 1984;Rappaport & Rappaport, 1967;Sinoto & McCoy, 1975;Steadman & Pahlavan, 1992 Burley, 1996aBurley, ,b, 1997Dye, 1987bDye, , 1996Poulsen, 1968Poulsen, , 1987Spennemann, 1989;Steadman, 1993a;…”