Table 1.

Census tract boundaries over time: number of tracts experiencing various types of changes between 1990-2000 and 2000-2010

Type of Change	From 1990 to 2000		From 2000 to 2010
No change	43,507	66.6%	50,062	68.8%
Many to one	969	1.5%	999	1.4%
One to two	5,962	9.1%	9,288	12.8%
One to three	1,722	2.6%	2,013	2.8%
One to four +	1,005	1.5%	1,267	1.7%
Many to many	12,144	18.6%	9,110	12.5%
Total	65,309	100.0%	72,739	100.0%