How to substract some values in different line using awk? : I have a data that separated by "|". This date is occurs every 15th minutes. What I want to do is to substract this data and multiply it with 100 but it seems didn't work. Can someone help me. Thank you :)

bash-4.2$ cat kresna.txt 
2019-05-29 16:48:01||196579|1637589633|0|109423435|101347165|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0||0|0|111|1554983|1554990|0||0|6347782|0|0|0|0|||1637602667|8747|13287295146|283512|1636036853|38771|||326516100|101703893|145340456|6988739|224616616|107247291|7764|101598218|19745231|0
2019-05-29 17:03:01||197446|1637876915|0|109456309|101349847|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0||0|0|111|1552437|1552441|0||0|6336110|0|0|0|0|||1637889948|8747|13290533845|283553|1636326689|38771|||326591972|101734973|145373623|6990480|224660545|107268556|7764|101629298|19748302|0

awk -F "|" '{if(NR>1){print (1 - ($45+$47+$49-_m) / ($44+$46+$48-_n) *100)};_n=$44+$46+$48;_m=$45+$47+$49}' kresna.txt
0.998926


That expected output is to e 99.98