The foreign-born (FB) population increased from 9,772 in 1970 to 27,215 in 2010. That was an increase of 178.5 percent. The foreign-born share changed from 3.6 percent to 7.8 percent.
The share of the overall population that was native-born (NB) increased by 22.8 percent.
Rockford MSA: Population 1970-2010
The first chart below shows the three population change factors for three periods adjusted for annual average amounts. Natural change (B-D) was the main factor adding population in all periods.
The second chart shows the same data but with an adjustment to reflect births to immigrants shifted to NIM. In it, B-D continued to be the primary factor in adding population in the first two periods, replaced by NIM in the latest period.
Rockford MSA: Sources of Population Change 1990-2014 Rockford MSA: Sources of Population Change (Adjusted) 1990-2014
B-D NDM NIM B-D NDM NIM 90-'99 75.3% 8.9% 15.9% 90-'99 60.5% 8.9% 30.6% 00-'09 57.2% 21.0% 21.8% 00-'09 41.4% 21.0% 37.6% 10-'14 77.5% neg. 22.5% 10-'14 41.7% neg. 58.3%
1/ Boone and Winnebago counties.
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