In the last century (1998), I received 1994 and 1996 comparison data just by asking the Long Island Railroad Commuters Council, which passed my request to the LIRR Community Affairs bureau. Rather than post the entire comparison (plus and minus), let me do just the Nassau stations in 1996 (based on morning pasenger counts at each station). The order is from most increase to most loss (1994-1996), but that is of little import now. I was grateful that they provided the interesting list.
Hicksville 6,290
Mineola 2,217
Great Neck 2,989
Syosset 2,351
Valley Stream 2,209
Farmingdale 986
Westbury 1,482
Freeport 1,536
Lynbrook 1,452
Glen Head 164
Island Park 1,145
Merillon Ave 590
West Hempstead 226
Garden City 581
Locust Valley 178
Woodmere 629
Lawrence 263
Nassau Blvd 676
Manhasset 2,185
East Rockaway 472
Albertson 170
Oyster Bay 57
Malverne 524
Glen Cove 147
Seaford 1,412
Far Rockaway 58
Mill Neck 2
Gibson 493
Westwood 345
Lakeview 302
Baldwin 2,890
Greenvale 82
Carle Place 294
Bellerose 510
Glen Street 145
Stewart Manor 759
Hewlett 641
Bellmore 2, 689
Plandome 465
Sea Cliff 188
East Williston 459
Roslyn 231
Massapequa 2,508
Country Life Press 298
Floral Park 1,213
Hempstead Garden139
Oceanside 1,258
Centre Ave 483
Cedarhusrst 516
New Hyde Park 1,168
Port Washington 2,429
Bethpage 1,069
Massapequa Park 1,475
Hempstead 800
Inwood 232
Merrick 2,797
Rockville Centre 2,147
Long Beach 1,631
Wantagh 2,723
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The list includes Suffolk, Queens, and Brooklyn, if you are interested.