余姚市图书馆

年份 居民文教区 混合区 工业集中区 交通干线两侧 昼 夜 昼 夜 昼 夜 昼 夜 1988 55.0 42.4 56.3 45.9 59.8 56.8 — — 1989 51.0 35.6 54.3 42.4 57.3 57.3 — — 1990 56.0 38.4 55.2 45.7 58.4 56.3 — — 1991 58.2 46.2 66.3 53.0 61.4 61.1 — — 1992 55.0 43.3 61.1 56.6 56.2 53.6 — — 1993 54.5 41.3 57.0 46.9 56.4 49.6 — — 1994 55.5 42.3 58.4 48.6 58.8 55.9 — — 1995 66.4 51.0 65.1 53.9 — — — — 1996 52.6 4K.6 68.2 48.8 59.9 58.0 71.8 60.8 1997 50.5 52.4 63.2 65.0 60.1 67.4 64.9 69.4 1998 47.0 37.8 58.3 45.2 63.0 57.3 81.9 69.4 1999 53.1 51.6 59.8 53.2 70.3 62.9 59.0 63.3 2000 51.4 51.1 56.9 49.1 60.7 57.9 61.5 55.7 2001 51.4 51.1 56.9 49.1 60.7 57.9 61.5 55.7 2002 60.2 61.1 62.6 56.5 61.6 64.4 58.5 61.8 2003 57.9 48.3 59.6 54.5 61.2 59.2 64.8 55.8 2004 53.6 43.0 58.9 49.2 58.0 52.7 65.3 55.2 2005 50.7 42.4 55.8 48.6 57.8 53.2 63.6 54.5 2006 53.1 44.7 55.6 47.1 62.0 52.2 65.7 53.6 2007 48.6 44.0 56.1 51.2 58.6 54.1 63.9 57.8 2008 48.5 40.6 57.1 51.6 59.8 56.0 63.4 58.6 2009 50.0 46.1 57.3 51.0 62.3 56.2 64.7 57.0 2010 52.9 49.6 54.9 49.3 63.3 56.6 64.5 59.4 标准值 55 45 60 50 65 55 70 55