We present extensive observations of the radio emission from the remnant of SN 1987A made with the Australia Telescope Compact Array ( ATCA ) , since the first detection of the remnant in 1990 .
The radio emission has evolved in time providing unique information on the interaction of the supernova shock with the circumstellar medium .
We particularly focus on the monitoring observations at 1.4 , 2.4 , 4.8 and 8.6 GHz , which have been made at intervals of 4 – 6 weeks .
The flux density data show that the remnant brightness is now increasing exponentially , while the radio spectrum is flattening .
The current spectral index value of -0.68 represents an 18 \pm 3 \% increase over the last 8 years .
The exponential trend in the flux is also found in the ATCA imaging observations at 9 GHz , which have been made since 1992 , approximately twice a year , as well as in the 843 MHz data set from the Molonglo Observatory Synthesis Telescope from 1987 to March 2007 .
Comparisons with data at different wavelengths ( X-ray , H \alpha ) are made .
The rich data set that has been assembled in the last 22 years forms a basis for a better understanding of the evolution of the supernova remnant .