Figura 1: Source: Internet Software Consortium (http://www.isc.org)

                              |     Survey    Adjusted     Replied
                        Date  | Host Count  Host Count    To Ping*
                      --------+-----------------------------------
                      Jan 2001|109,574,429                  -
           
                      Jul 2000| 93,047,785                  -
                      Jan 2000| 72,398,092                  -

                      Jul 1999| 56,218,000                  -
                      Jan 1999| 43,230,000               8,426,000

                      Jul 1998| 36,739,000               6,529,000
                      Jan 1998| 29,670,000               5,331,640   

                      Jul 1997| 19,540,000  26,053,000   4,314,410   
                      Jan 1997| 16,146,000  21,819,000   3,392,000
 
                      Jul 1996| 12,881,000  16,729,000   2,569,000
                      Jan 1996|  9,472,000  14,352,000   1,682,000
 
                      Jul 1995|  6,642,000   8,200,000   1,149,000
                      Jan 1995|  4,852,000   5,846,000     970,000

                      Jul 1994|  3,212,000                 707,000
                      Jan 1994|  2,217,000                 576,000
 
                      Jul 1993|  1,776,000                 464,000
                      Jan 1993|  1,313,000