Year	1981	1982	1983	1984
	 Jan	1474	1456	1494	1357
	 Feb	1458	1445	1057	1165
	 Mar	1542	1456	1218	1282
	 Apr	1404	1365	1168	1110
	 May	1522	1487	1236	1297
	 Jun	1385	1558	1076	1185
	 Jul	1641	1488	1174	1222
	 Aug	1510	1684	1139	1284
	 Sep	1681	1594	1427	1444
	 Oct	1938	1850	1487	1575
	 Nov	1868	1998	1483	1737
	 Dec	1726	2079	1513	1763