In JEE ADVANCED there is no such  rule that if you score 60% then you will get rank under 1000. First of all you must note everything depends on the difficulty level of paper, marking schemes etc. In year 2015 difficulty level of the paper was slightly lower than 2018 but due to marking scheme students score less. Similarly in year 2016 difficulty level was quite high so score also get reduced. I will like to put some statistics before you and you will understand yourself.

Year                        Rank-1000       Rank-5000

2015(F.M 504)         56.75%.           40.48%

2016(F.M 372)          49.46%.           36.02%

2017(F.M 366)           71.75%             58.21%

2018(F.M 360)            59.16%              43.88%

From year 2017 partial marking system is introduced for multiple correct questions so there is slight increase in scores are observed.