Table:
text: List of Sites of Special Scientific Interest in Derbyshire
Sites
Sites
Site_name Reason_for_designation_Biological_interest Reason_for_designation_Geological_interest Area_Hectares Area_Acres Coordinates_Grid_ref Year_in_which_notified Other_designations Map_Citation_
Pleasley Vale Railway   3.5 8.7 53°10′41″N 1°13′23″W﻿ / ﻿53.178°N 1.223°W ,     SK520648 1981 LNR Map
Poole`s Cavern and Grin Low Wood   41.5 102.6 53°14′49″N 1°55′37″W﻿ / ﻿53.247°N 1.927°W ,     SK050722 1963 GCR Map
Portway Mine   4.2 10.5 53°19′37″N 1°48′32″W﻿ / ﻿53.327°N 1.809°W ,     SK128811 1990 GCR Map
River Derwent at Hathersage   7.9 19.4 53°19′48″N 1°40′23″W﻿ / ﻿53.33°N 1.673°W ,     SK219815 1992  Map
River Mease   22.9 56.5 52°42′18″N 1°35′35″W﻿ / ﻿52.705°N 1.593°W ,     SK276120 2000 SAC Map
Rose End Meadows   48.4 119.7 53°06′25″N 1°35′28″W﻿ / ﻿53.107°N 1.591°W ,     SK275567 1996  Map
Rowlee Bridge   1.0 2.4 53°23′56″N 1°46′55″W﻿ / ﻿53.399°N 1.782°W ,     SK146891 1986 GCR Map

Question: How many Sites of Special Scientific Interest have been included on the List of Sites of Special Scientific Interest in Derbyshire after 2000?